The Oconee River is a 220-mile-long (350 km) river which has its origin in Hall County, Georgia, and terminates where it joins the Ocmulgee River to form the Altamaha River near Lumber City at the borders of Montgomery County, Wheeler County, and Jeff Davis County. South of Athens, two forks, known as the North Oconee River and Middle Oconee River, converge to form the Oconee River.