Landing Rd., Mill Branch Rd., Queen Anne Rd., and Brandywine Rd. Walking access along roads in this area is very limited, because most property along the roads remains in private ownership. However, walking is much more accessible in the widespread M-NCPPC lands and trails and state holdings in the Patuxent valley, such as Merkle Wildlife Sanctuary and Rosaryville State Park, both popular among hikers and mountain bikers. South County South County is a blend of the greenery of the rural tier and the new development of central county. The communities of Clinton, Oxon Hill, Temple Hills and Fort Washington are the largest areas of south county. It is the only portion of Prince George's County to enjoy the Potomac River waterfront, and that geographic distinction has yielded the rise of the National Harbor project: a town center and riverside shopping and living development on the Potomac. The National Harbor, and its associated entertainment (MGM National Harbor) and shopping (Tanger Outlets) districts, have become a major tourist and convention attraction, with significant hotel accommodations, eateries and shopping. Together, these projects were built on land formerly occupied by the Salubria plantation, where a 14-year-old slave girl poisoned her owner, John H. Bayne, and his family in 1831. Water taxi service connects National Harbor to other destinations along the Potomac. Several historic sites, including Jones Point Lighthouse, can be viewed from the harbor front. Piscataway Park in Accokeek preserves many acres of woodland and wetlands along the Potomac River opposite Mount Vernon, Virginia. River Road in Fort Washington also yields great views of the Potomac. Fort Washington Park was a major battery and gives access to the public for tours of the fort, scenic access to the river and other picnic grounds. Oxon Hill Manor offers a working farm and plantation mansion for touring; His Lordship's Kindness is another major historic home. Also, Fort Foote is an old American Civil War fort and tourist destination. Adjacent counties and independent cities Anne Arundel County (east) Calvert County (southeast) Charles County (south) Howard County (north) Montgomery County (northwest) Fairfax County, Virginia (southwest) Alexandria, Virginia (southwest) Washington, D.C. (west) Prince George's and Montgomery Counties share a bi-county planning and parks agency in the M-NCPPC and a public bi-county water and sewer utility in the Washington Suburban Sanitary Commission National protected areas Fort Washington Park Greenbelt Park Patuxent Wildlife Research Refuge (part) Piscataway Park Cedarville State Forest