Columbia River in BC, Canada.

The Columbia River is designated a B.C. Heritage River, and is the largest river in the Pacific Northwest region of North America, and the fourth largest river by volume in North America. The river rises from its headwaters near Canal Flats in the Canadian Rocky Mountains of British Columbia. It's source is Columbia Lake at 2,690 ft above sea level. From here it flows approximately 2,000km northwest through Golden to Revelstoke, 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, dropping 820 metres before emptying into the Pacific Ocean at Astoria, Oregon. Along the way, the Columbia River passes through 14 hydroelectric dams on its main stem and many more in its tribuaries, including the Kicking Horse River and Blueberry River, producing more hydroelectric power than those of any other North American river.