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Which U.S. states does the Columbia River flow through or border?
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Columbia River
Columbia River Gorge, Oregon-Washington border.
The Columbia River flows through or borders two U.S. states:
- Washington: The river enters the United States in the northeastern part of this state and traverses its east-central region in a sweeping curve known as the Big Bend.1
- Oregon: The river serves as the boundary between Oregon and Washington for its final 300 miles as it flows toward the Pacific Ocean.1
Would you like to learn more about the river's tributaries or its role in regional navigation?