The Columbia River is a major river in the Pacific Northwest region of North America. It flows for about 1,243 miles, starting in the Rocky Mountains of British Columbia, Canada, and emptying into the Pacific Ocean at Astoria, Oregon. The river serves as a natural border between the states of Washington and Oregon. The Columbia River is known for its significant role in transportation, irrigation, and hydroelectric power generation. It is home to several dams, including the Grand Coulee Dam, which is one of the largest in the United States. The river also supports diverse ecosystems and recreational activities like fishing and boating.