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Potomac River
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The Potomac River is in the Mid-Atlantic region of the United States and flows from the Potomac Highlands in West Virginia to the 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.