Great Falls (Potomac River)

Great Falls is a series of rapids and waterfalls on the Potomac River in the state of Maryland 14 miles (23 km) upstream from Washington, D.C. As the border between the states of Maryland and Virginia generally follows the low-water line on the Virginia side, the river and falls at Great Falls lie within Montgomery County, Maryland, which abuts Fairfax County, Virginia on the far shore. Great Falls Park, managed as part of George Washington Memorial Parkway, is on the southern banks in Virginia, and Chesapeake and Ohio Canal National Historical Park parkland is along the northern banks of the river in Maryland.

Source: Wikipedia — Great Falls (Potomac River) (CC BY-SA 4.0)