The Columbia River is a
river in the
Pacific Northwest region of
North America. It stretches from the
Canadian province of
British Columbia, through the
U.S. state of
Washington, and forms much of the border between Washington and
Oregon before emptying into the
Pacific Ocean.The Columbia is the largest river (measured by volume) flowing into the Pacific from the
Western Hemisphere, and is the fourth-largest in North America, behind the
Mississippi,
St. Lawrence, and
Mackenzie Rivers. (In rare years, the river’s flow may actually exceed that of the Mississippi.) The Columbia's average annual flow is about 265,000 ft³/s (7,500 m³/s). It flows 1,243 miles (2,000 km) from its headwaters to the Pacific, draining 258,000 square miles (668,217 km²), of which about 15% is in Canada.
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