The Ujście Warty National Park, also, Warta River Mouth National Park, (Polish: Park Narodowy Ujście Warty) is the youngest of Poland's 23 National Parks. It was created on June 19, 2001, in the region of the lowest stretch of the Warta river, up to its confluence with the Odra (Oder), which marks the Polish–German border. The Park covers an area of 80.38 square kilometres (31.03 sq mi) within Lubusz Voivodeship.