The Columbia River is the longest in the Pacific Northwest.

The Columbia River, flowing for about 1,243 miles, is the longest in the Pacific Northwest, traversing the U.S. states of Oregon and Washington. Originating from the Rocky Mountains in British Columbia, Canada, it flows into the Pacific Ocean. The river is crucial to the region's economy, serving as a major transportation route for goods and as a key source of hydroelectric power through the Bonneville Dam and other projects. It also has great ecological and cultural significance for Native American tribes and settlers in the region. The Columbia River Basin spans several states and Canada.