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href="//cy.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://cy.wikipedia.org/wiki/Ynys_Llanddwyn"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.cy"> <link rel="alternate" type="application/atom+xml" title="Ffrwd Atom Wicipedia" href="/w/index.php?title=Arbennig:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Ynys_Llanddwyn rootpage-Ynys_Llanddwyn skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Neidio i'r cynnwys</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Safle"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Prif ddewislen" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Prif ddewislen</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Prif ddewislen</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">symud i'r bar ochr</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">cuddio</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Panel llywio </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage" class="mw-list-item"><a href="/wiki/Hafan" title="Ymweld â'r Hafan [z]" accesskey="z"><span>Hafan</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wicipedia:Porth_y_Gymuned" title="Pethau i'w gwneud, adnoddau a thudalennau'r gymuned"><span>Porth y Gymuned</span></a></li><li id="n-cafe" class="mw-list-item"><a href="/wiki/Wicipedia:Y_Caffi"><span>Y Caffi</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Categori:Materion_cyfoes" title="Gwybodaeth yn gysylltiedig â materion cyfoes"><span>Materion cyfoes</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Arbennig:RecentChanges" title="Rhestr y newidiadau diweddar ar y wici. [r]" accesskey="r"><span>Newidiadau diweddar</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Arbennig:Random" title="Llwytho tudalen ar hap [x]" accesskey="x"><span>Erthygl ar hap</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Wicipedia:Cymorth" title="Tudalennau cymorth"><span>Cymorth</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Hafan" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wicipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-cy.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="" src="/static/images/mobile/copyright/wikipedia-tagline-cy.svg" width="120" height="13" style="width: 7.5em; height: 0.8125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Arbennig:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Chwilio Wicipedia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Chwilio</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Chwilio Wicipedia" aria-label="Chwilio Wicipedia" autocapitalize="sentences" title="Chwilio Wicipedia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Arbennig:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Chwilio</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Offer personol"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Gwedd"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Newidiwch ymddangosiad maint ffont, lled a lliw y dudalen" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Gwedd" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Gwedd</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_cy.wikipedia.org&uselang=cy" class=""><span>Rhoi</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Arbennig:CreateAccount&returnto=Ynys+Llanddwyn" title="Rydym yn argymell eich bod yn creu cyfri ac yn menwgofnodi. Fodd bynnag, dydy hyn ddim yn orfodol" class=""><span>Creu cyfrif</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Arbennig:UserLogin&returnto=Ynys+Llanddwyn" title="Fe'ch anogir i fewngofnodi, er nad oes rhaid gwneud. [o]" accesskey="o" class=""><span>Mewngofnodi</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Rhagor o opsiynau" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Offer personol" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Offer personol</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Dewislen defnyddiwr" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_cy.wikipedia.org&uselang=cy"><span>Rhoi</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Arbennig:CreateAccount&returnto=Ynys+Llanddwyn" title="Rydym yn argymell eich bod yn creu cyfri ac yn menwgofnodi. Fodd bynnag, dydy hyn ddim yn orfodol"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Creu cyfrif</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Arbennig:UserLogin&returnto=Ynys+Llanddwyn" title="Fe'ch anogir i fewngofnodi, er nad oes rhaid gwneud. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Mewngofnodi</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Tudalennau ar gyfer golygyddion allgofnodedig <a href="/wiki/Cymorth:Cyflwyniad" aria-label="Dysgu mwy am olygu"><span>dysgu mwy</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Arbennig:MyContributions" title="Rhestr golygiadau o'r cyfeiriad IP hwn [y]" accesskey="y"><span>Cyfraniadau</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Arbennig:MyTalk" title="Sgwrs ynglŷn â golygiadau o'r cyfeiriad IP hwn [n]" accesskey="n"><span>Sgwrs</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Safle"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Cynnwys" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Cynnwys</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">symud i'r bar ochr</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">cuddio</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Y dechrau</div> </a> </li> <li id="toc-Eglwys_y_Santes_Dwynwen" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Eglwys_y_Santes_Dwynwen"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Eglwys y Santes Dwynwen</span> </div> </a> <ul id="toc-Eglwys_y_Santes_Dwynwen-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Natur" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Natur"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Natur</span> </div> </a> <ul id="toc-Natur-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Goleudai" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Goleudai"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Goleudai</span> </div> </a> <ul id="toc-Goleudai-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Gweler_hefyd" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Gweler_hefyd"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Gweler hefyd</span> </div> </a> <ul id="toc-Gweler_hefyd-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Cyfeiriadau" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Cyfeiriadau"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Cyfeiriadau</span> </div> </a> <ul id="toc-Cyfeiriadau-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Cynnwys" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toglo'r tabl cynnwys" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toglo'r tabl cynnwys</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Ynys Llanddwyn</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ewch i erthygl mewn iaith arall. Ar gael mewn 11 iaith" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-11" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">11 iaith</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Llydaweg" lang="br" hreflang="br" data-title="Ynys Llanddwyn" data-language-autonym="Brezhoneg" data-language-local-name="Llydaweg" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ceb mw-list-item"><a href="https://ceb.wikipedia.org/wiki/Llanddwyn_Island" title="Llanddwyn Island - Cebuano" lang="ceb" hreflang="ceb" data-title="Llanddwyn Island" data-language-autonym="Cebuano" data-language-local-name="Cebuano" class="interlanguage-link-target"><span>Cebuano</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Almaeneg" lang="de" hreflang="de" data-title="Ynys Llanddwyn" data-language-autonym="Deutsch" data-language-local-name="Almaeneg" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Saesneg" lang="en" hreflang="en" data-title="Ynys Llanddwyn" data-language-autonym="English" data-language-local-name="Saesneg" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-fiu-vro mw-list-item"><a href="https://fiu-vro.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Võro" lang="vro" hreflang="vro" data-title="Ynys Llanddwyn" data-language-autonym="Võro" data-language-local-name="Võro" class="interlanguage-link-target"><span>Võro</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Ffrangeg" lang="fr" hreflang="fr" data-title="Ynys Llanddwyn" data-language-autonym="Français" data-language-local-name="Ffrangeg" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Eidaleg" lang="it" hreflang="it" data-title="Ynys Llanddwyn" data-language-autonym="Italiano" data-language-local-name="Eidaleg" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Norwyeg Nynorsk" lang="nn" hreflang="nn" data-title="Ynys Llanddwyn" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwyeg Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Pwyleg" lang="pl" hreflang="pl" data-title="Ynys Llanddwyn" data-language-autonym="Polski" data-language-local-name="Pwyleg" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%98%D0%BD%D0%B8%D1%81-%D0%9B%D0%BB%D0%B0%D0%BD%D0%B4%D1%83%D0%B8%D0%BD" title="Инис-Лландуин - Rwseg" lang="ru" hreflang="ru" data-title="Инис-Лландуин" data-language-autonym="Русский" data-language-local-name="Rwseg" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Ynys_Llanddwyn" title="Ynys Llanddwyn - Swedeg" lang="sv" hreflang="sv" data-title="Ynys Llanddwyn" data-language-autonym="Svenska" data-language-local-name="Swedeg" class="interlanguage-link-target"><span>Svenska</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q769655#sitelinks-wikipedia" title="Golygu dolenni rhyngwici" class="wbc-editpage">Golygu dolenni</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Parthau"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Ynys_Llanddwyn" title="Gweld y dudalen bwnc [c]" accesskey="c"><span>Erthygl</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Sgwrs:Ynys_Llanddwyn" rel="discussion" title="Sgwrsio am y dudalen [t]" accesskey="t"><span>Sgwrs</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Newid amrywiad iaith" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Cymraeg</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Golygon"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Ynys_Llanddwyn"><span>Darllen</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit" title="Golygu'r dudalen hon [v]" accesskey="v"><span>Golygu</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit" title="Golygu cod ffynhonnell y dudalen hon [e]" accesskey="e"><span>Golygu cod</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&action=history" title="Fersiynau cynt o'r dudalen hon. [h]" accesskey="h"><span>Gweld hanes</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Offer tudalen"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Blwch offer" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Blwch offer</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Blwch offer</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">symud i'r bar ochr</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">cuddio</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Rhagor o opsiynau" > <div class="vector-menu-heading"> Gweithredoedd </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Ynys_Llanddwyn"><span>Darllen</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit" title="Golygu'r dudalen hon [v]" accesskey="v"><span>Golygu</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit" title="Golygu cod ffynhonnell y dudalen hon [e]" accesskey="e"><span>Golygu cod</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&action=history"><span>Gweld hanes</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Cyffredinol </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Arbennig:WhatLinksHere/Ynys_Llanddwyn" title="Rhestr o bob tudalen sy'n cysylltu â hon [j]" accesskey="j"><span>Beth sy'n cysylltu yma</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Arbennig:RecentChangesLinked/Ynys_Llanddwyn" rel="nofollow" title="Newidiadau diweddar i dudalennau sydd yn cysylltu â hon [k]" accesskey="k"><span>Newidiadau perthnasol</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Arbennig:SpecialPages" title="Rhestr o'r holl dudalennau arbennig [q]" accesskey="q"><span>Tudalennau arbennig</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&oldid=11847192" title="Dolen barhaol i'r fersiwn hwn y dudalen hon"><span>Dolen barhaol</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&action=info" title="Mwy o wybodaeth am y dudalen hon"><span>Gwybodaeth am y dudalen</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Arbennig:CiteThisPage&page=Ynys_Llanddwyn&id=11847192&wpFormIdentifier=titleform" title="Gwybodaeth ar sut i gyfeirio at y dudalen hon"><span>Cyfeirio at y dudalen hon</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Arbennig:UrlShortener&url=https%3A%2F%2Fcy.wikipedia.org%2Fwiki%2FYnys_Llanddwyn"><span>Cael URL byr</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Arbennig:QrCode&url=https%3A%2F%2Fcy.wikipedia.org%2Fwiki%2FYnys_Llanddwyn"><span>Lawrlwytho cod QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Argraffu / allforio </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Arbennig:Book&bookcmd=book_creator&referer=Ynys+Llanddwyn"><span>Llunio llyfr</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Arbennig:DownloadAsPdf&page=Ynys_Llanddwyn&action=show-download-screen"><span>Lawrlwytho fel PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Ynys_Llanddwyn&printable=yes" title="Cynhyrchwch fersiwn o'r dudalen yn barod at ei hargraffu [p]" accesskey="p"><span>Fersiwn argraffu</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> Mewn prosiectau eraill </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Ynys_Llanddwyn" hreflang="en"><span>Comin Wikimedia</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q769655" title="Cysylltu i eitem ystorfa gysylltiedig [g]" accesskey="g"><span>Eitem Wicidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Offer tudalen"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Gwedd"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Gwedd</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">symud i'r bar ochr</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">cuddio</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Oddi ar Wicipedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="cy" dir="ltr"><table class="infobox" style="width:22em"><caption>Ynys Llanddwyn</caption><tbody><tr><td colspan="2" style="text-align:center"><span typeof="mw:File"><a href="/wiki/Delwedd:Ynys_Llanddwyn_old_light.pg.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ynys_Llanddwyn_old_light.pg.jpg/280px-Ynys_Llanddwyn_old_light.pg.jpg" decoding="async" width="280" height="210" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ynys_Llanddwyn_old_light.pg.jpg/420px-Ynys_Llanddwyn_old_light.pg.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ynys_Llanddwyn_old_light.pg.jpg/560px-Ynys_Llanddwyn_old_light.pg.jpg 2x" data-file-width="1296" data-file-height="972" /></a></span></td></tr><tr><th scope="row">Math</th><td><a href="/wiki/Ynys_lanwol" title="Ynys lanwol">ynys lanwol</a> <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q769655?uselang=cy#P31" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr><tr><td colspan="2" style="text-align:center"><div class="center"></div></td></tr><tr><th colspan="2" style="text-align:center;background:#ddf;">Daearyddiaeth</th></tr><tr><th scope="row">Sir</th><td>Ynys Môn <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q769655?uselang=cy#P131" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr><tr><th scope="row">Gwlad</th><td><span typeof="mw:File"><a href="/wiki/Delwedd:Flag_of_Wales.svg" class="mw-file-description" title="Baner Cymru"><img alt="Baner Cymru" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Flag_of_Wales.svg/22px-Flag_of_Wales.svg.png" decoding="async" width="22" height="13" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Flag_of_Wales.svg/33px-Flag_of_Wales.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Flag_of_Wales.svg/44px-Flag_of_Wales.svg.png 2x" data-file-width="800" data-file-height="480" /></a></span> <a href="/wiki/Cymru" title="Cymru">Cymru</a></td></tr><tr><th scope="row">Arwynebedd</th><td>0.3 km² <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q769655?uselang=cy#P2046" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr><tr><th scope="row">Gerllaw</th><td><a href="/wiki/M%C3%B4r_Iwerddon" title="Môr Iwerddon">Môr Iwerddon</a> <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q769655?uselang=cy#P206" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr><tr><th scope="row">Cyfesurynnau</th><td>53.1375°N 4.4125°W <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q769655?uselang=cy#P625" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr><tr><td colspan="2" style="text-align:center"><a class="mw-kartographer-map notheme mw-kartographer-container center" style="width: 280px; height: 250px;" data-mw-kartographer="mapframe" data-style="osm-intl" data-width="280" data-height="250" data-zoom="8" data-lat="53.1375" data-lon="-4.4125" data-overlays="["_80697eb2e2401174589a32b96ba19e54d8bbe86a"]" href="/wiki/Arbennig:Map/8/53.1375/-4.4125/cy"><img src="https://maps.wikimedia.org/img/osm-intl,8,53.1375,-4.4125,280x250.png?lang=cy&domain=cy.wikipedia.org&title=Ynys_Llanddwyn&revid=11847192&groups=_80697eb2e2401174589a32b96ba19e54d8bbe86a" width="280" height="250" decoding="async" srcset="https://maps.wikimedia.org/img/osm-intl,8,53.1375,-4.4125,280x250@2x.png?lang=cy&domain=cy.wikipedia.org&title=Ynys_Llanddwyn&revid=11847192&groups=_80697eb2e2401174589a32b96ba19e54d8bbe86a 2x" alt="Map" /></a></td></tr><tr><td colspan="2" style="text-align:center"><div style="text-align: center;"><span typeof="mw:File"><span title="Tudalen Comin"><img alt="Tudalen Comin" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span> <a href="https://commons.wikimedia.org/wiki/Category:Ynys_Llanddwyn" class="extiw" title="commons:Category:Ynys Llanddwyn">Ffeiliau perthnasol ar Comin</a></div></td></tr><tr><td colspan="2" style="text-align:center"><div class="metadata" style="text-align: right;">[<a href="https://www.wikidata.org/wiki/Q769655" class="extiw" title="d:Q769655">golygwch ar Wicidata</a>]</div></td></tr></tbody></table> <p>Ynys lanw yng <a href="/wiki/Cymuned_(Cymru)" title="Cymuned (Cymru)">nghymuned Rhosyr</a> ger <a href="/wiki/Niwbwrch" title="Niwbwrch">Niwbwrch</a> ar arfordir de-orllewinol <a href="/wiki/Ynys_M%C3%B4n" title="Ynys Môn">Ynys Môn</a>, yng ngogledd <a href="/wiki/Cymru" title="Cymru">Cymru</a>, yw <b>Ynys Llanddwyn</b>. Caiff ei gysylltu i'r tir mawr gyda <a href="/wiki/Sarn" class="mw-disambig" title="Sarn">sarn</a> (neu rimyn o dir) pan fo'r llanw ar drai. Yn yr Oesoedd Canol bu'n rhan o gwmwd <a href="/wiki/Menai" title="Menai">Menai</a>, <a href="/wiki/Cantref" title="Cantref">cantref</a> <a href="/wiki/Aberffraw_(cantref)" title="Aberffraw (cantref)">Aberffraw</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Eglwys_y_Santes_Dwynwen">Eglwys y Santes Dwynwen</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit&section=1" title="Golygu'r adran: Eglwys y Santes Dwynwen" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit&section=1" title="Edit section's source code: Eglwys y Santes Dwynwen"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Cysylltir yr ynys fechan hon â'r Santes <a href="/wiki/Dwynwen" class="mw-redirect" title="Dwynwen">Dwynwen</a>, <a href="/wiki/Nawddsant" title="Nawddsant">nawddsant</a> cariadon Cymru. Gellir cyrraedd gweddillion yr <a href="/wiki/Eglwys" title="Eglwys">eglwys</a> a gysegrir i Ddwynwen trwy ddilyn llwybr troed ar hyd yr ynys o'r sarn. Mae'r adfeilion yn perthyn i'r <a href="/wiki/16g" class="mw-redirect" title="16g">16g</a> ond credir bod eglwys hynafol ar y safle cyn hynny. Roedd yr eglwys hon yn rhan o ofalaeth <a href="/wiki/Eglwys_Gadeiriol_Bangor" title="Eglwys Gadeiriol Bangor">Eglwys Gadeiriol Bangor</a> a dyfodd yn gefnog gan fod cynifer o bererinion yn ymweld â'r ynys yn <a href="/wiki/Yr_Oesoedd_Canol" title="Yr Oesoedd Canol">yr Oesoedd Canol</a>. Ger yr eglwys mae Ffynnon Ddwynwen; credid fod symudiadau'r pysgod ynddi yn <a href="/wiki/Darogan" title="Darogan">darogan</a> y dyfodol i gariadon. </p> <div class="mw-heading mw-heading2"><h2 id="Natur">Natur</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit&section=2" title="Golygu'r adran: Natur" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit&section=2" title="Edit section's source code: Natur"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Gellir cerdded i'r ynys dros y sarn tywod meddal pan fo'r llanw allan. Mae'n Warchodfa Natur. Ceir nifer o rywiogaethau o flodau gwyllt yno, yn cynnwys <a href="/wiki/Pig_yr_Aran" title="Pig yr Aran">Pig yr Aran</a> (Mynawyd y bugail). Ym mis Hydref mae nifer o adar i'w gweld ar yr ynys, gan gynnwys <a href="/wiki/Pibydd_coesgoch" title="Pibydd coesgoch">pibyddion coesgoch</a> a <a href="/wiki/Pioden_f%C3%B4r" title="Pioden fôr">phiod môr</a>. Mae'r creigiau ar yr ynys yn perthyn i'r cyfnod cynambrian ac maent yn dros chwe chant miliwn mlwydd oed.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>Ym mhen draw'r ynys mae rhes o fythynnod pysgotwyr a dau <a href="/wiki/Goleudy" title="Goleudy">oleudy</a>. Mae'r <a href="/wiki/Bae" title="Bae">baeau</a> bychain yn dywodlyd. Ceir nifer o ynysoedd llai o'i chwmpas; <a href="/wiki/Ynys_yr_Adar" title="Ynys yr Adar">Ynys yr Adar</a> yw'r fwyaf o'r rhain. </p><p>Ceir golygfeydd o'r ynys dros fryniau <a href="/wiki/Eryri" title="Eryri">Eryri</a> a'r <a href="/wiki/Yr_Eifl" title="Yr Eifl">Eifl</a> i'r de a'r de-orllewin. </p> <div class="mw-heading mw-heading2"><h2 id="Goleudai">Goleudai</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit&section=3" title="Golygu'r adran: Goleudai" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit&section=3" title="Edit section's source code: Goleudai"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Ar Ynys Llanddwyn cewch ddau dŵr,Twr Bach a Thwr Mawr. Yn <a href="/wiki/1819" title="1819">1819</a> gosodwyd colofn tua 40 troedfedd ar safle y Twr Bach fel Tirnod. Adeiladwyd glanfa fachfel cysgod i longau a oedd yn disgwyl llanw mawr i fynd trwy'r Bar am <a href="/wiki/Caernarfon" title="Caernarfon">Gaernarfon</a>. Ond roedd problem gyda'r golofn. Roedd hi'n rhy isel ac felly doedd llongau o bell methu â gweld y golofn. Felly codwyd colofn fwy ar graig o'r enw Craig Estyth. Roedd y greigen yn greigen fwy na'r creigiau eraill. Gwyn galchwyd y ddwy golofn ac ar <a href="/wiki/Dydd_Calan" title="Dydd Calan">Ddydd Calan</a> <a href="/wiki/1846" title="1846">1846</a> goleuwyd lamp fawr ar ben y Twr Mawr i forwyr gael eu harwain i mewn i <a href="/wiki/Abermenai" title="Abermenai">Abermenai</a> yn y tywyllwch. </p> <ul class="gallery mw-gallery-packed"> <li class="gallerybox" style="width: 162px"> <div class="thumb" style="width: 160px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Ynys_Llanddwyn_old_light.pg.jpg" class="mw-file-description" title="Ynys Llanddwyn a'i goleudy yn y gaeaf"><img alt="Ynys Llanddwyn a'i goleudy yn y gaeaf" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ynys_Llanddwyn_old_light.pg.jpg/240px-Ynys_Llanddwyn_old_light.pg.jpg" decoding="async" width="160" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ynys_Llanddwyn_old_light.pg.jpg/360px-Ynys_Llanddwyn_old_light.pg.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ynys_Llanddwyn_old_light.pg.jpg/480px-Ynys_Llanddwyn_old_light.pg.jpg 2x" data-file-width="1296" data-file-height="972" /></a></span></div> <div class="gallerytext">Ynys Llanddwyn a'i goleudy yn y gaeaf</div> </li> <li class="gallerybox" style="width: 161.33333333333px"> <div class="thumb" style="width: 159.33333333333px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Llanddwyn.JPG" class="mw-file-description" title="Y lleiaf o'r ddau oleudy, yng nghanol haf"><img alt="Y lleiaf o'r ddau oleudy, yng nghanol haf" src="//upload.wikimedia.org/wikipedia/cy/thumb/d/d0/Llanddwyn.JPG/239px-Llanddwyn.JPG" decoding="async" width="160" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/cy/thumb/d/d0/Llanddwyn.JPG/359px-Llanddwyn.JPG 1.5x, //upload.wikimedia.org/wikipedia/cy/thumb/d/d0/Llanddwyn.JPG/478px-Llanddwyn.JPG 2x" data-file-width="660" data-file-height="497" /></a></span></div> <div class="gallerytext">Y lleiaf o'r ddau oleudy, yng nghanol haf</div> </li> <li class="gallerybox" style="width: 162px"> <div class="thumb" style="width: 160px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Cadair_y_Cythraul_(The_Demon%27s_Chair)_-_geograph.org.uk_-_255123.jpg" class="mw-file-description" title="Cadair y Cythraul, ar y tir mawr gerllaw'r Ynys."><img alt="Cadair y Cythraul, ar y tir mawr gerllaw'r Ynys." src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Cadair_y_Cythraul_%28The_Demon%27s_Chair%29_-_geograph.org.uk_-_255123.jpg/240px-Cadair_y_Cythraul_%28The_Demon%27s_Chair%29_-_geograph.org.uk_-_255123.jpg" decoding="async" width="160" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Cadair_y_Cythraul_%28The_Demon%27s_Chair%29_-_geograph.org.uk_-_255123.jpg/360px-Cadair_y_Cythraul_%28The_Demon%27s_Chair%29_-_geograph.org.uk_-_255123.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Cadair_y_Cythraul_%28The_Demon%27s_Chair%29_-_geograph.org.uk_-_255123.jpg/480px-Cadair_y_Cythraul_%28The_Demon%27s_Chair%29_-_geograph.org.uk_-_255123.jpg 2x" data-file-width="640" data-file-height="480" /></a></span></div> <div class="gallerytext">Cadair y Cythraul, ar y tir mawr gerllaw'r Ynys.</div> </li> <li class="gallerybox" style="width: 162px"> <div class="thumb" style="width: 160px;"><span typeof="mw:File"><a href="/wiki/Delwedd:LlanddwynLB10.JPG" class="mw-file-description" title="Y sarn sy'n cysylltu'r ynys (ar y dde) a'r tir mawr (ar y chwith)."><img alt="Y sarn sy'n cysylltu'r ynys (ar y dde) a'r tir mawr (ar y chwith)." src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/LlanddwynLB10.JPG/240px-LlanddwynLB10.JPG" decoding="async" width="160" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/LlanddwynLB10.JPG/360px-LlanddwynLB10.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/LlanddwynLB10.JPG/480px-LlanddwynLB10.JPG 2x" data-file-width="2048" data-file-height="1536" /></a></span></div> <div class="gallerytext">Y sarn sy'n cysylltu'r ynys (ar y dde) a'r tir mawr (ar y chwith).</div> </li> <li class="gallerybox" style="width: 162px"> <div class="thumb" style="width: 160px;"><span typeof="mw:File"><a href="/wiki/Delwedd:LlanddwynLB20.JPG" class="mw-file-description" title="Machlud haul"><img alt="Machlud haul" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/77/LlanddwynLB20.JPG/240px-LlanddwynLB20.JPG" decoding="async" width="160" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/77/LlanddwynLB20.JPG/360px-LlanddwynLB20.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/77/LlanddwynLB20.JPG/480px-LlanddwynLB20.JPG 2x" data-file-width="2048" data-file-height="1536" /></a></span></div> <div class="gallerytext">Machlud haul</div> </li> <li class="gallerybox" style="width: 81.333333333333px"> <div class="thumb" style="width: 79.333333333333px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg" class="mw-file-description" title="Clwyd, gyda'r goleudy yn y pellter"><img alt="Clwyd, gyda'r goleudy yn y pellter" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg/119px-Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg" decoding="async" width="80" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg/179px-Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg/238px-Gate_at_Ynys_Llanddwyn_DSC_7961_-1.jpg 2x" data-file-width="1004" data-file-height="1515" /></a></span></div> <div class="gallerytext">Clwyd, gyda'r goleudy yn y pellter</div> </li> <li class="gallerybox" style="width: 182px"> <div class="thumb" style="width: 180px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Twr_Bach_Llanddwyn_Island_Lighthouse.jpg" class="mw-file-description" title="Yr hen oleudy"><img alt="Yr hen oleudy" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Twr_Bach_Llanddwyn_Island_Lighthouse.jpg/270px-Twr_Bach_Llanddwyn_Island_Lighthouse.jpg" decoding="async" width="180" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Twr_Bach_Llanddwyn_Island_Lighthouse.jpg/405px-Twr_Bach_Llanddwyn_Island_Lighthouse.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Twr_Bach_Llanddwyn_Island_Lighthouse.jpg/540px-Twr_Bach_Llanddwyn_Island_Lighthouse.jpg 2x" data-file-width="5989" data-file-height="3993" /></a></span></div> <div class="gallerytext">Yr hen oleudy</div> </li> <li class="gallerybox" style="width: 181.33333333333px"> <div class="thumb" style="width: 179.33333333333px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg" class="mw-file-description" title="Bae"><img alt="Bae" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg/269px-Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg" decoding="async" width="180" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg/404px-Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg/539px-Secluded_Cove_on_Ynys_Llanddwyn_-_geograph.org.uk_-_491084.jpg 2x" data-file-width="640" data-file-height="428" /></a></span></div> <div class="gallerytext">Bae</div> </li> <li class="gallerybox" style="width: 164px"> <div class="thumb" style="width: 162px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Ruins_at_Llanddwyn,_Anglesey.jpg" class="mw-file-description" title="Yr hen eglwys 'Eglwys Santes Dwynwen'; allan o A tour in Wales gan Thomas Pennant (1726-1798)"><img alt="Yr hen eglwys 'Eglwys Santes Dwynwen'; allan o A tour in Wales gan Thomas Pennant (1726-1798)" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Ruins_at_Llanddwyn%2C_Anglesey.jpg/243px-Ruins_at_Llanddwyn%2C_Anglesey.jpg" decoding="async" width="162" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Ruins_at_Llanddwyn%2C_Anglesey.jpg/365px-Ruins_at_Llanddwyn%2C_Anglesey.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Ruins_at_Llanddwyn%2C_Anglesey.jpg/486px-Ruins_at_Llanddwyn%2C_Anglesey.jpg 2x" data-file-width="2107" data-file-height="1560" /></a></span></div> <div class="gallerytext">Yr hen eglwys 'Eglwys Santes Dwynwen'; allan o <i>A tour in Wales</i> gan Thomas Pennant (1726-1798)</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Gweler_hefyd">Gweler hefyd</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit&section=4" title="Golygu'r adran: Gweler hefyd" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit&section=4" title="Edit section's source code: Gweler hefyd"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Cwningar_Niwbwrch_-_Ynys_Llanddwyn" title="Cwningar Niwbwrch - Ynys Llanddwyn">Cwningar Niwbwrch - Ynys Llanddwyn</a> (<a href="/wiki/Safle_o_Ddiddordeb_Gwyddonol_Arbennig" title="Safle o Ddiddordeb Gwyddonol Arbennig">Safle o Ddiddordeb Gwyddonol Arbennig</a>)</li></ul> <div class="mw-heading mw-heading2"><h2 id="Cyfeiriadau">Cyfeiriadau</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ynys_Llanddwyn&veaction=edit&section=5" title="Golygu'r adran: Cyfeiriadau" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ynys_Llanddwyn&action=edit&section=5" title="Edit section's source code: Cyfeiriadau"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><cite class="citation book"><i>Cylchgrawn Sir Môn</i>. Wasg Gee, Dinbych. 1972. t. 12.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Cylchgrawn+Sir+M%C3%B4n&rft.pages=12&rft.pub=Wasg+Gee%2C+Dinbych&rft.date=1972&rfr_id=info%3Asid%2Fcy.wikipedia.org%3AYnys+Llanddwyn" class="Z3988"></span><style data-mw-deduplicate="TemplateStyles:r8312344">.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}</style></span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Wedi dod o "<a dir="ltr" href="https://cy.wikipedia.org/w/index.php?title=Ynys_Llanddwyn&oldid=11847192">https://cy.wikipedia.org/w/index.php?title=Ynys_Llanddwyn&oldid=11847192</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Arbennig:Categories" title="Arbennig:Categories">Categorïau</a>: <ul><li><a href="/wiki/Categori:Afon_Menai" title="Categori:Afon Menai">Afon Menai</a></li><li><a href="/wiki/Categori:Eglwysi_Ynys_M%C3%B4n" title="Categori:Eglwysi Ynys Môn">Eglwysi Ynys Môn</a></li><li><a href="/wiki/Categori:Rhosyr" title="Categori:Rhosyr">Rhosyr</a></li><li><a href="/wiki/Categori:Ynysoedd_M%C3%B4n" title="Categori:Ynysoedd Môn">Ynysoedd Môn</a></li><li><a href="/wiki/Categori:Ynysoedd_llanwol" title="Categori:Ynysoedd llanwol">Ynysoedd llanwol</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Chategori cudd: <ul><li><a href="/wiki/Categori:Tudalennau_gyda_meysydd_deublyg_yn_y_Nodion" title="Categori:Tudalennau gyda meysydd deublyg yn y Nodion">Tudalennau gyda meysydd deublyg yn y Nodion</a></li><li><a href="/wiki/Categori:Erthyglau_sy%27n_defnyddio_Nodyn_Gwybodlen_lle_Wicidata" title="Categori:Erthyglau sy'n defnyddio Nodyn Gwybodlen lle Wicidata">Erthyglau sy'n defnyddio Nodyn Gwybodlen lle Wicidata</a></li><li><a href="/wiki/Categori:Pages_using_the_Kartographer_extension" title="Categori:Pages using the Kartographer extension">Pages using the Kartographer extension</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Golygwyd y dudalen hon ddiwethaf ar 17 Awst 2023, am 20:44.</li> <li id="footer-info-copyright">Mae'r testun ar gael o dan <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-ShareAlike License</a>; gall telerau ychwanegol fod yn berthnasol. 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