Washington and Old Dominion Railroad Regional Park

The Washington and Old Dominion Railroad Regional Park is a linear regional park in Northern Virginia. The park's primary feature is the Washington and Old Dominion Railroad Trail, an asphalt-surfaced paved rail trail that runs through densely populated urban and suburban communities as well as through rural areas. Most of the trail travels on top of the rail bed of the former Washington and Old Dominion Railroad, which closed in 1968.

Although the park is 44.6 miles long, it is only about 100 feet wide. The rail trail is approximately 10 feet wide through much of its length and is a shared use path that is suitable for walking, running, cycling, and roller skating.