Tenmile Lake is the largest and southernmost of a chain of lakes along the Oregon Coast south of the Umpqua River in the United States. The chain includes North Tenmile, Eel, Clear, and smaller lakes, which drain into the Pacific Ocean via Tenmile Creek. The lake is 8 miles (13 km) south of Reedsport and 0.5 miles (0.80 km) east of U.S. Route 101 near the community of Lakeside.