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Columbia Basin




The Columbia Basin, the Drainage Basin of the Columbia River , occupies a large area— about 673,396 square kilometres (260,000 square miles) — of western North America . The Columbia Basin includes portions of the Canadian province of British Columbia and the American states of Idaho , Montana , Oregon , Washington , and very small portions of California , Nevada , Utah , and Wyoming . The Columbia Basin extends from the Rocky Mountains in the east to the Pacific Ocean in the west.

Residents of the area surrounding the confluence of the Columbia and Snake rivers — a region centering on the Tri-Cities, Washington metropolitan area — use the term "Columbia Basin" to refer to their own, much smaller region.

The dry flat region at the centre of the Columbia Basin is known as the Columbia River Plateau .


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