The Piscataway Headwaters Preserve is privately owned by the John M. and Sara R. Walton Foundation, Inc. in Prince George’s County, Maryland. The property contains a historic single-family residence (built in 1735), a caretaker’s residence, agricultural fields, pastures, and barns associated with the active horse boarding operation. Wetland restoration/creation and enhancement efforts were undertaken in 2017-2018. This portion of the farm had previously been used as pastures since prior to 1938. Prior to conversion to pasture, these areas were historically comprised of a mosaic of forested, freshwater wetlands, and uplands.