The Dan River flows in both the U.S. states of North Carolina and Virginia. It originates in the state of Virginia in Patrick County and crosses the state border into Stokes County, North Carolina. It then flows into Rockingham County. From there it goes back into Virginia. It reenters North Carolina near the border between Caswell County and Rockingham County. It flows into northern Caswell County and then back into Virginia and finally into Kerr Reservoir on the Roanoke River.