The Chetco River is a river in southwestern Oregon in the United States, approximately 55 mi (88 km) long. It drains a rugged isolated coastal region in the extreme southwestern corner of the state near the California border, descending steeply from 3700 ft (1130 m) to the Pacific Ocean over its course. Except for the lower 5 mi (8 km), the river is located in the Siskiyou National Forest.