Maybe it's just me, but that looks like the Potomac River in the area close to Great Falls.

filipinowhiteboy said in comment #2604217:

Maybe it's just me, but that looks like the Potomac River in the area close to Great Falls.

For reference: Wikipedia: Great Falls (Potomac River).

The Potomac River's Great Falls is part of the fall line located along North America's east coast and one of the major determinants on where many major US east coast cities are located.