The South Branch Blackwater River is an U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed June 22, 2011 river in Aroostook County, Maine. From its source () in Maine Township 9, Range 3, WELS, the stream runs northwest to its confluence with the North Branch to form the Blackwater River in Squa Pan Township (T. 10, R. 4, WELS). Via the Blackwater River, St. Croix Stream, and the Aroostook River, the South Branch is part of the Saint John River watershed.

See also List of rivers of Maine

References

Maine Streamflow Data from the USGS Maine Watershed Data From Environmental Protection Agency