The Oxon Run Parkway is a corridor of federal park land in the Washington Highlands neighborhood of Washington, D.C. The Parkway once extended across the District's southern corner in a crescent from Hillcrest Heights to Oxon Hill but most of it became Oxon Run Park in 1971, and now only the portion north of 13th Street still uses the Parkway name. It was originally intended to provide recreation space, but was later enlarged to provide flood relief, space for a major piece of sewer infrastructure and the possibility of a clean drinking water source.