Potomac River

The Potomac River in the Mid-Atlantic region of the United States flows from the Potomac Highlands in West Virginia to Chesapeake Bay in Maryland. It is 405 miles (652 km) long, with a drainage area of 14,700 square miles (38,000 km²), and is the fourth-largest river along the East Coast of the United States. More than 6 million people live within its watershed.