The Savannah River flows between the states of South Carolina and Georgia and accepts drainage from both states. The portion of the Savannah River Basin within South Carolina encompasses 3,171,462 acres and is subdivided into 34 watersheds (10-digit hydrologic unit) that flow from the Blue Ridge and Piedmont regions of the state to the Sandhills, the Upper and Lower Coastal Plain and Coastal Zone regions. Within South Carolina, the Savannah River Basin includes the Tugaloo River/Seneca River Basin (hydrologic units 03060102, 03060101), the Upper Savannah River Basin (hydrologic unit 03060103), and the Lower Savannah River Basin (hydrologic units 03060106, 03060107, 03060109, 03060110). The Tugaloo River/Seneca River Basin is subdivided into 12 watersheds that include The Chattooga River, the Tugaloo River, Lake Jocassee, the Keowee River, Lake Keowee, the Little River, Twelvemile Creek, Coneross Creek, Eighteenmile Creek, Six and Twenty Creek, Lake Hartwell, and the Seneca River. The Upper Savannah River Basin is subdivided into 6 watersheds that include the Savannah River, Lake Hartwell, the Rocky River, Lake Russell, the Little River, Lake Thurmond, and Long Cane Creek. The Lower Savannah River Basin is subdivided into 16 watersheds that include the Savannah River, Stevens Creek Reservoir, Horse Creek, Hollow Creek, Upper Three Runs, Lower Three Runs, Stevens Creek, Turkey Creek, Great Swamp, the New River, the May River, and Calibougue Sound. There are a total of 13,206 stream miles in the Savannah River Basin within South Carolina and 170,122 acres of lake waters. .