where does the columbia river start and finish
Columbia River The Columbia River is the largest river in the Pacific Northwest region of North America.[9] The river rises in the Rocky Mountains of British Columbia, Canada. It flows northwest and then south into the US 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. The river is 1,243 miles (2,000Â km) long, and its largest tributary is the Snake River. Its drainage basin is roughly the size of France and extends into seven US states and a Canadian province. The fourth-largest river in the United States by volume, the Columbia has the greatest flow of any North American river entering the Pacific.
British Columbia British Columbia (BC or B.C.Â ; French: Colombie-Britannique) is the westernmost province of Canada, located between the Pacific Ocean and the Rocky Mountains. With an estimated population of 4.8 million as of 2017, it is Canada's third-most populous province.