The fourth-largest river in the United States by volume, the Columbia has the greatest flow of any North American river entering the Pacific. Its drainage basin is roughly the size of France and extends into seven US states and a Canadian province. The river is 1,243 miles (2,000 km) long, and its largest tributary is the Snake River. state of Washington, then turns west to form most of the border between Washington and the state of Oregon before emptying into the Pacific Ocean.
It flows northwest and then south into the U.S. The river rises in the Rocky Mountains of British Columbia, Canada.
The Columbia River ( Upper Chinook: Wimahl or Wimal Sahaptin: Nch’i-Wàna or Nchi wana Sinixt dialect swah'netk'qhu) is the largest river in the Pacific Northwest region of North America. Kicking Horse River, Blaeberry River, Canoe River, Kettle River, Sanpoil River, Okanogan River, Entiat River, Wenatchee River, Yakima River, Lewis River, Cowlitz River Spillimacheen River, Beaver River, Illecillewaet River, Incomappleux River, Kootenay River, Pend Oreille River, Spokane River, Crab Creek, Snake River, John Day River, Deschutes River, Willamette River
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