Starting Point at the District of Columbia/PG County line and the intersection of Pennsylvania Avenue (Rt. 4). Follow Rt. 4 to Dower House Road. Follow outer boundary of Andrew Air Force Base back to Branch Avenue (Rt. 301/5). Follow Route 5 South to Brandywine Rd. (Rt. 373). Go west on Rt. 373 then W on Floral Park RD. Continue on Floral Park Rd. to Danville Rd. Follow Danville Rd SE to Brandywine Rd. (Rt. 373).
Follow Brandywine Rd. W to Gardner Rd. Follow Gardner Rd S to the Prince George's County border (Piscataway Creek). Follow Prince George's County Line W then SW to Billingsley Rd. then NNW to the Potomac River. Follow Potomac River to Maryland /DC border. Follow Maryland /DC border back to starting point, District of Columbia/PG County line and the intersection of Pennsylvania Avenue (Rt. 4).
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