Where does the cloumbia river flows?

It is also the largest river by volume that wholly flows within the United States. The river originates in Columbia Lake, British Columbia, Canada, and flows through Canada and the U.S. states of Washington and Oregon. The Columbia River drains a total area of 259,000 square kilometers (100,000 sq mi) making it the 20th-largest drainage system by area in the world.

The river is fed by snowmelt from the Rocky Mountains and the Cascade Range, and from rainfall in coastal regions. The Columbia River is a major source of hydroelectric power, and its dams provide flood control and irrigation water for agriculture. The river is also a major transportation route, and it is navigable for commercial shipping for over 400 miles (640 km) from the Pacific Ocean to Portland, Oregon.

The Columbia River is home to a variety of fish species including salmon, steelhead, trout, and bass. The river is also a major migration route for birds and other wildlife. The Columbia River is a vital resource for the people of the Pacific Northwest, and it plays an important role in the region's economy and environment.