Stretching 184.5 miles along the Potomac River between Washington, D.C. and Cumberland, Maryland, the Chesapeake and Ohio Canal National Historical Park preserves remains of America's colorful canal era. For nearly a century, the C&O Canal was the lifeline for communities and businesses along the Potomac, as coal, lumber, grain, and other agricultural products gently floated down the canal to market. This magnificent water highway linked the rapidly growing west to the east and played an important role in the growth and development of our country.