Explore Dyke Marsh Wildlife Preserve Near River Towers

The Dyke Marsh Wildlife Preserve is a freshwater, tidal marsh on the Virginia side of the Potomac River in Fairfax County. It is a unit of the George Washington Memorial Parkway, U.S. National Park Service. Dyke Marsh is one of the largest remaining freshwater tidal wetlands in the Washington metropolitan area. Its 485 acres of tidal marsh, floodplain, and swamp forest can be explored by boat or on foot.