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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_no.wikipedia.org&uselang=nb" class=""><span>Doner</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=Spesial:Opprett_konto&returnto=Vassdrag" title="Du oppfordres til å opprette en konto og logge inn, men det er ikke obligatorisk" class=""><span>Opprett konto</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=Spesial:Logg_inn&returnto=Vassdrag" title="Du oppfordres til å logge inn, men det er ikke obligatorisk [o]" accesskey="o" class=""><span>Logg inn</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 user-links-collapsible-item" title="Flere alternativer" > <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="Personlig" > <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">Personlig</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Brukermeny" > <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_no.wikipedia.org&uselang=nb"><span>Doner</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spesial:Opprett_konto&returnto=Vassdrag" title="Du oppfordres til å opprette en konto og logge inn, men det er ikke obligatorisk"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Opprett konto</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spesial:Logg_inn&returnto=Vassdrag" title="Du oppfordres til å logge inn, men det er ikke obligatorisk [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Logg inn</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="Nettsted"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Vassdrag</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="Gå til en artikkel på et annet språk. Tilgjengelig på 35 språk" > <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-35" 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">35 språk</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Vassdrag" title="Vassdrag – norsk nynorsk" lang="nn" hreflang="nn" data-title="Vassdrag" data-language-autonym="Norsk nynorsk" data-language-local-name="norsk nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Flodsystem" title="Flodsystem – dansk" lang="da" hreflang="da" data-title="Flodsystem" data-language-autonym="Dansk" data-language-local-name="dansk" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Flusssystem" title="Flusssystem – sveitsertysk" lang="gsw" hreflang="gsw" data-title="Flusssystem" data-language-autonym="Alemannisch" data-language-local-name="sveitsertysk" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D9%86%D8%B8%D9%88%D9%85%D8%A9_%D8%AA%D8%B5%D8%B1%D9%8A%D9%81_(%D9%85%D9%88%D8%B1%D9%81%D9%88%D9%84%D9%88%D8%AC%D9%8A%D8%A7_%D8%A7%D9%84%D8%A3%D8%B1%D8%B6)" title="منظومة تصريف (مورفولوجيا الأرض) – arabisk" lang="ar" hreflang="ar" data-title="منظومة تصريف (مورفولوجيا الأرض)" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Drenaj_sistemi" title="Drenaj sistemi – aserbajdsjansk" lang="az" hreflang="az" data-title="Drenaj sistemi" data-language-autonym="Azərbaycanca" data-language-local-name="aserbajdsjansk" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%99%D1%8B%D0%BB%D2%93%D0%B0_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0%D2%BB%D1%8B" title="Йылға системаһы – basjkirsk" lang="ba" hreflang="ba" data-title="Йылға системаһы" data-language-autonym="Башҡортса" data-language-local-name="basjkirsk" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A0%D0%B0%D1%87%D0%BD%D0%B0%D1%8F_%D1%81%D1%96%D1%81%D1%82%D1%8D%D0%BC%D0%B0" title="Рачная сістэма – belarusisk" lang="be" hreflang="be" data-title="Рачная сістэма" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A0%D0%B5%D1%87%D0%BD%D0%B0_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0" title="Речна система – bulgarsk" lang="bg" hreflang="bg" data-title="Речна система" data-language-autonym="Български" data-language-local-name="bulgarsk" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Xarxa_de_drenatge" title="Xarxa de drenatge – katalansk" lang="ca" hreflang="ca" data-title="Xarxa de drenatge" data-language-autonym="Català" data-language-local-name="katalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/%C5%98%C3%AD%C4%8Dn%C3%AD_syst%C3%A9m" title="Říční systém – tsjekkisk" lang="cs" hreflang="cs" data-title="Říční systém" data-language-autonym="Čeština" data-language-local-name="tsjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Flusssystem" title="Flusssystem – tysk" lang="de" hreflang="de" data-title="Flusssystem" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/J%C3%B5gikond" title="Jõgikond – estisk" lang="et" hreflang="et" data-title="Jõgikond" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Drainage_system_(geomorphology)" title="Drainage system (geomorphology) – engelsk" lang="en" hreflang="en" data-title="Drainage system (geomorphology)" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Red_de_drenaje" title="Red de drenaje – spansk" lang="es" hreflang="es" data-title="Red de drenaje" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%D8%A7%D9%85%D8%A7%D9%86%D9%87_%D8%B2%D9%87%DA%A9%D8%B4%DB%8C_(%DA%98%D8%A6%D9%88%D9%85%D9%88%D8%B1%D9%81%D9%88%D9%84%D9%88%DA%98%DB%8C)" title="سامانه زهکشی (ژئومورفولوژی) – persisk" lang="fa" hreflang="fa" data-title="سامانه زهکشی (ژئومورفولوژی)" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/R%C3%A9seau_de_drainage_(g%C3%A9omorphologie)" title="Réseau de drainage (géomorphologie) – fransk" lang="fr" hreflang="fr" data-title="Réseau de drainage (géomorphologie)" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%88%98%EA%B3%84" title="수계 – koreansk" lang="ko" hreflang="ko" data-title="수계" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%85%E0%A4%AA%E0%A4%B5%E0%A4%BE%E0%A4%B9_%E0%A4%A4%E0%A4%A8%E0%A5%8D%E0%A4%A4%E0%A5%8D%E0%A4%B0" title="अपवाह तन्त्र – hindi" lang="hi" hreflang="hi" data-title="अपवाह तन्त्र" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Sistem_sungai" title="Sistem sungai – indonesisk" lang="id" hreflang="id" data-title="Sistem sungai" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D3%A8%D0%B7%D0%B5%D0%BD_%D1%82%D0%BE%D1%80%D1%8B" title="Өзен торы – kasakhisk" lang="kk" hreflang="kk" data-title="Өзен торы" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-mni mw-list-item"><a href="https://mni.wikipedia.org/wiki/%EA%AF%82%EA%AF%9D-%EA%AF%87%EA%AF%A8" title="ꯂꯝ-ꯇꯨ – manipuri" lang="mni" hreflang="mni" data-title="ꯂꯝ-ꯇꯨ" data-language-autonym="ꯃꯤꯇꯩ ꯂꯣꯟ" data-language-local-name="manipuri" class="interlanguage-link-target"><span>ꯃꯤꯇꯩ ꯂꯣꯟ</span></a></li><li class="interlanguage-link interwiki-mdf mw-list-item"><a href="https://mdf.wikipedia.org/wiki/%D0%9B%D1%8F%D0%B5%D0%BD%D1%8C_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0%D1%81%D1%8C" title="Ляень системась – moksja" lang="mdf" hreflang="mdf" data-title="Ляень системась" data-language-autonym="Мокшень" data-language-local-name="moksja" class="interlanguage-link-target"><span>Мокшень</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Drainagepatroon" title="Drainagepatroon – nederlandsk" lang="nl" hreflang="nl" data-title="Drainagepatroon" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E6%B0%B4%E7%B3%BB" title="水系 – japansk" lang="ja" hreflang="ja" data-title="水系" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Daryo_sistemasi" title="Daryo sistemasi – usbekisk" lang="uz" hreflang="uz" data-title="Daryo sistemasi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbekisk" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Sie%C4%87_rzeczna" title="Sieć rzeczna – polsk" lang="pl" hreflang="pl" data-title="Sieć rzeczna" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Rede_de_drenagem" title="Rede de drenagem – portugisisk" lang="pt" hreflang="pt" data-title="Rede de drenagem" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A0%D0%B5%D1%87%D0%BD%D0%B0%D1%8F_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0" title="Речная система – russisk" lang="ru" hreflang="ru" data-title="Речная система" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/River_system" title="River system – enkel engelsk" lang="en-simple" hreflang="en-simple" data-title="River system" data-language-autonym="Simple English" data-language-local-name="enkel engelsk" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Rie%C4%8Dny_syst%C3%A9m" title="Riečny systém – slovakisk" lang="sk" hreflang="sk" data-title="Riečny systém" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Uomaverkosto" title="Uomaverkosto – finsk" lang="fi" hreflang="fi" data-title="Uomaverkosto" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A3%E0%B8%B0%E0%B8%9A%E0%B8%9A%E0%B8%A5%E0%B8%B3%E0%B8%98%E0%B8%B2%E0%B8%A3" title="ระบบลำธาร – thai" lang="th" hreflang="th" data-title="ระบบลำธาร" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Drenaj_sistemi" title="Drenaj sistemi – tyrkisk" lang="tr" hreflang="tr" data-title="Drenaj sistemi" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A0%D1%96%D1%87%D0%BA%D0%BE%D0%B2%D0%B0_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0" title="Річкова система – ukrainsk" lang="uk" hreflang="uk" data-title="Річкова система" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%B0%B4%E7%B3%BB" title="水系 – kinesisk" lang="zh" hreflang="zh" data-title="水系" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</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/Q285451#sitelinks-wikipedia" title="Rediger lenker til artikkelen på andre språk" class="wbc-editpage">Rediger lenker</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="Navnerom"> <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/Vassdrag" title="Vis innholdssiden [c]" accesskey="c"><span>Artikkel</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Diskusjon:Vassdrag" rel="discussion" title="Diskusjon om innholdssiden [t]" accesskey="t"><span>Diskusjon</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="Bytt språkvariant" > <label 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title="Rediger siden [v]" accesskey="v"><span>Rediger</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Vassdrag&action=edit" title="Rediger kildekoden for denne siden [e]" accesskey="e"><span>Rediger kilde</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Vassdrag&action=history" title="Tidligere sideversjoner av denne siden [h]" accesskey="h"><span>Vis historikk</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Sideverktøy"> <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="Verktøy" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" 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class="mw-content-ltr mw-parser-output" lang="nb" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Hydrographic_basin.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Hydrographic_basin.svg/250px-Hydrographic_basin.svg.png" decoding="async" width="250" height="246" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Hydrographic_basin.svg/375px-Hydrographic_basin.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Hydrographic_basin.svg/500px-Hydrographic_basin.svg.png 2x" data-file-width="760" data-file-height="749" /></a><figcaption>Et skjematisk vassdrag. Den stiplede linjen er <a href="/wiki/Vannskille" title="Vannskille">vannskillet</a>, som markerer yttergrensen for vassdragets <a href="/wiki/Nedb%C3%B8romr%C3%A5de" class="mw-redirect" title="Nedbørområde">nedbørområde</a></figcaption></figure> <p>Et <b>vassdrag</b> er et sammenhengende system av <a href="/wiki/Elv" title="Elv">elver</a>, <a href="/wiki/Bekk" title="Bekk">bekker</a>, <a href="/wiki/Innsj%C3%B8" title="Innsjø">innsjøer</a> og <a href="/wiki/Isbre" title="Isbre">isbreer</a> innenfor et <a href="/wiki/Nedb%C3%B8romr%C3%A5de" class="mw-redirect" title="Nedbørområde">nedbørområde</a>, regnet fra sine utspring i skog og fjell og ned til et felles utløp i <a href="/wiki/Hav" title="Hav">havet</a>, en innsjø eller ei større elv. </p><p>Fjellkjeder og andre høydedrag utgjør ofte et <a href="/wiki/Vannskille" title="Vannskille">vannskille</a>. </p><p><a href="/wiki/Amazonas" title="Amazonas">Amazonas</a> er verdens største vassdrag, med et nedbørfelt på 6 144 727 km², noe som utgjør en tredjedel av <a href="/wiki/S%C3%B8r-Amerika" title="Sør-Amerika">Sør-Amerikas</a> <a href="/wiki/Areal" title="Areal">areal</a>. <a href="/wiki/Europa" title="Europa">Europas</a> største vassdrag er <a href="/wiki/Volga" title="Volga">Volga</a> (1 410 994 km²). </p> <div class="mw-heading mw-heading2"><h2 id="Vassdrag_i_Norge">Vassdrag i Norge</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Vassdrag&veaction=edit&section=1" title="Rediger avsnitt: Vassdrag i Norge" class="mw-editsection-visualeditor"><span>rediger</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Vassdrag&action=edit&section=1" title="Rediger kildekoden til seksjonen Vassdrag i Norge"><span>rediger kilde</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="utdypende-artikkel" style="padding-left:2em; font-style: italic;"> <p>Utdypende artikkel: <a href="/wiki/Vassdrag_i_Norge" title="Vassdrag i Norge">Vassdrag i Norge</a> </p> </div> <p>I <a href="/wiki/Norge" title="Norge">Norge</a> finnes det om lag 4000 vassdrag, hvorav nærmere 3000 enten er lengre enn 10 <a href="/wiki/Km" class="mw-redirect" title="Km">km</a> eller har sjøer som er større enn 1 km².<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> Norges største vassdrag er <a href="/wiki/Glommavassdraget" title="Glommavassdraget">Glommavassdraget</a>, med et nedbørfelt på 41 917 km². </p><p>25–30 % av Norges vassdrag er regulert for <a href="/wiki/Vannkraftverk" title="Vannkraftverk">kraftproduksjon</a> <sup class="Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Hjelp:Trenger_referanse" title="Hjelp:Trenger referanse"><span title="Foregående påstand trenger referanse">trenger referanse</span></a></i>]</sup>. </p> <div class="mw-heading mw-heading2"><h2 id="Ulike_vassdragsmønstre"><span id="Ulike_vassdragsm.C3.B8nstre"></span>Ulike vassdragsmønstre</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Vassdrag&veaction=edit&section=2" title="Rediger avsnitt: Ulike vassdragsmønstre" class="mw-editsection-visualeditor"><span>rediger</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Vassdrag&action=edit&section=2" title="Rediger kildekoden til seksjonen Ulike vassdragsmønstre"><span>rediger kilde</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Et utvalg av forskjellige typer vassdragsmønstre: </p> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:Dendritic_Drainage_pattern.jpg" class="mw-file-description" title="Dendrittisk vassdragssystem"><img alt="Dendrittisk vassdragssystem" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c6/Dendritic_Drainage_pattern.jpg/120px-Dendritic_Drainage_pattern.jpg" decoding="async" width="120" height="98" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c6/Dendritic_Drainage_pattern.jpg/180px-Dendritic_Drainage_pattern.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c6/Dendritic_Drainage_pattern.jpg/240px-Dendritic_Drainage_pattern.jpg 2x" data-file-width="1001" data-file-height="820" /></a></span></div> <div class="gallerytext">Dendrittisk vassdragssystem</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:Parallel_drainage_pattern.jpg" class="mw-file-description" title="Parallelt vassdragssystem"><img alt="Parallelt vassdragssystem" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Parallel_drainage_pattern.jpg/120px-Parallel_drainage_pattern.jpg" decoding="async" width="120" height="99" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Parallel_drainage_pattern.jpg/180px-Parallel_drainage_pattern.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Parallel_drainage_pattern.jpg/240px-Parallel_drainage_pattern.jpg 2x" data-file-width="425" data-file-height="352" /></a></span></div> <div class="gallerytext">Parallelt vassdragssystem</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:Rectangular.png" class="mw-file-description" title="Rektangulært vassdragssystem"><img alt="Rektangulært vassdragssystem" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Rectangular.png/112px-Rectangular.png" decoding="async" width="112" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Rectangular.png/168px-Rectangular.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Rectangular.png/224px-Rectangular.png 2x" data-file-width="323" data-file-height="346" /></a></span></div> <div class="gallerytext">Rektangulært vassdragssystem</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:Radial.png" class="mw-file-description" title="Radialt vassdragssystem"><img alt="Radialt vassdragssystem" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Radial.png/112px-Radial.png" decoding="async" width="112" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Radial.png/168px-Radial.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Radial.png/224px-Radial.png 2x" data-file-width="323" data-file-height="346" /></a></span></div> <div class="gallerytext">Radialt vassdragssystem</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Se_også"><span id="Se_ogs.C3.A5"></span>Se også</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Vassdrag&veaction=edit&section=3" title="Rediger avsnitt: Se også" class="mw-editsection-visualeditor"><span>rediger</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Vassdrag&action=edit&section=3" title="Rediger kildekoden til seksjonen Se også"><span>rediger kilde</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Liste_over_verdens_lengste_elver" title="Liste over verdens lengste elver">Liste over verdens lengste elver</a></li> <li><a href="/wiki/Liste_over_elver_i_Europa" title="Liste over elver i Europa">Liste over elver i Europa</a></li> <li><a href="/wiki/Liste_over_elver_i_Norge" title="Liste over elver i Norge">Liste over elver i Norge</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Referanser">Referanser</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Vassdrag&veaction=edit&section=4" title="Rediger avsnitt: Referanser" class="mw-editsection-visualeditor"><span>rediger</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Vassdrag&action=edit&section=4" title="Rediger kildekoden til seksjonen Referanser"><span>rediger kilde</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><b><a href="#cite_ref-1">^</a></b> <span class="reference-text">Jon Arne Eie, Per Einar Faugli og Jens Aabel: <i>Elver og vann. Vern av norske vassdrag</i>. Grøndahl Dreyer 1996. <a href="/wiki/Spesial:Bokkilder/8250422414" class="internal mw-magiclink-isbn">ISBN 82 504 2241 4</a></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Eksterne_lenker">Eksterne lenker</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Vassdrag&veaction=edit&section=5" title="Rediger avsnitt: Eksterne lenker" class="mw-editsection-visualeditor"><span>rediger</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Vassdrag&action=edit&section=5" title="Rediger kildekoden til seksjonen Eksterne lenker"><span>rediger kilde</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.miljostatus.no/vernede-vassdrag/">Miljøstatus i Norge: Vernede vassdrag</a></li> <li><a rel="nofollow" class="external text" href="http://www.miljostatus.no/Vassdragsutbygging/">Miljøstatus i Norge: Vassdragsutbygging</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160424162106/http://www.miljostatus.no/Vassdragsutbygging/">Arkivert</a> 24. april 2016 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r23230704">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul 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