- Potomac, Potomac River - a river in the east central United States; rises in West Virginia in the Appalachian Mountains and flows eastward, forming the boundary between Maryland and Virginia, to the Chesapeake Bay
--1 is a kind of river
--1 is a part ofWest Virginia, Mountain State, WV; Maryland, Old Line State, Free State, MD; Virginia, Old Dominion, Old Dominion State, VA