Great Falls on the Potomac River

The Great Falls of the Potomac River are located at the fall line of the Potomac River, 14 miles (23 km) upstream from Washington, D.C. Great Falls Park, operated by the National Park Service, is located on the southern banks in Virginia, while Chesapeake and Ohio Canal parkland is located along the northern banks of the river in Maryland. The Potomac and the falls themselves are within Maryland. (wikipedia caption)