High Quality Content by WIKIPEDIA articles! The Hiwassee River has its headwaters on the north slope of Rocky Mountain in Towns County in northern Georgia (as the Hiawassee River) and flows northward into North Carolina (there assuming its more common moniker Hiwassee) before turning westward into Tennessee, flowing into the Tennessee River a few miles west of State Route 58 in Meigs County, Tennessee. The river is 147 miles (237 km) long.