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historyRiversWashingtonsmostimportantandlargestriveristheColumbia.Itcarriesmorethanhalfofthewaterthatfallsinthestateandcoversmorethan1000mileseColumbiabeginsinBritishColumbiaCanadaandowsthruWashingtoncreatingtheborderbetweenWashingtonandOregonbeforeemptyingintothePacicOcean.ItslargetributariesincludetheSnakeSpokaneOkanoganandYakimaRivers.elargestdamintheworldtheGrandCouleeDamisbuiltontheColumbiaRiver.WashingtonalsohasmanywildandscenicriversnamedforsomeofourNativetribessuchastheSkagitSnohomishYakamaandKlickitat.eseareimportantforwildlifeandarepopularforshingandbirdwatching.Andweareworld-renownedforourwhite-waterriversliketheMethowSkykomishandWenatcheewhereyoucanenjoyraftingkayakingandcanoeing.ARiverRunsruiteColumbiaRiverGorgeeGorgeasWashingtonianscallitistheonlynaturalbreakthroughtheCascadeMountains.isspectacularrivercanyonis90mileslongandupto4000feetdeepwiththenorthcanyonwallsinWashingtonStateandthesouthcanyonwallsinOregonState.Itssogorge-ousitsbeendeclaredaU.S.NationalScenicArea.HereyoucanseemorewaterfallsthananywhereelseintheNorthwestandenjoysomeofthebestwindsurngintheworld.LakesDidyouknowthattherearemorethan1000naturallakesinWashingtonSomewereformedbyglaciersothersareman-madelakescalledreservoirs.WashingtonslargestanddeepestnaturallakeisLakeChelan.Itis55mileslongwithcleanglacier-fedwaters.estateslargestlakeLakeRooseveltisactuallyaman-madelake.Itstretchesfor151milesbehindtheGrandCouleedam.Otherlargeman-madelakesareUmatillaLakebehindJohnDayDamLakeWallulabehindMcNaryDamandRossLakebehindRossDam.esearefunrecreationalareasforcampingandswimming.WashingtonsLargestNaturalLakesLakeChelan32000acresLakeWashington22138acresLakeOzette7787acresMosesLake6815acresLakeOsoyoos5723acresLakeCrescent5187acresLakeWhatcom5003acresLakeSammamish4897acresLakeQuinault3729acres10geographyWASHINGTONJohnMarshall