The Tugaloo River (originally Tugalo River) is a 45.9-mile-long (73.9 km) river bordering the U.S. states of Georgia and South Carolina. It is fed by the Tallulah River and the Chattooga River, which each form an arm of Lake Tugalo, on the edge of Georgia's Tallulah Gorge State Park. The Tugaloo then flows out of the lake via Tugaloo Dam, passing into Lake Yonah and through Yonah Dam. The river then ends as an arm of Lake Hartwell, as does South Carolina's Seneca River.