Kenilworth Park & Aquatic Gardens is a National Park Service site located in the north eastern corner of Washington, D.C. , and the Maryland state border. Nestled near the banks of the Anacostia River and directly south of the Baltimore Washington Parkway, Kenilworth Park & Aquatic Gardens preserves a plethora of rare waterlilies and lotuses in the cultivated ponds near the river. The park also contains the Kenilworth Marsh, the only remaining tidal marsh in Washington, D.C.