The "Warta River Mouth" National Park is an extremely valuable ornithological place of the area of more than 800 hectares which includes unique marsh, vast meadows and pastures. The entire place is one of the most important in Poland refuges of water and marsh birds. Some 270 species of birds have been identified in the Park of which 26 species are considered rare or endangered with extinction.
The Park was established on July 1, 2001 in the vicinity of the confluence of the rivers Warta Oder. The landscape of the Park is formed mainly by open meadow habitats crossed by a dense system of canals and old river-beds, and osier shrub. The Warta River flows across the middle of the Park and divides it into the so-called Northern Polder and the southern part, the latter situated in the area of the Kostrzyn Reservoir. Due to its inaccessibleness, the area has remained practically uninhabited for a long time. As late as in the late 18th century, a wide range of regulation and melioration works was started there. The history of the Warta River mouth is also very interesting. In the vicinity, one may find traces of the mysterious Order of Malta and Knights Templar, and numerous fortified structures, including the remainders of the buildings of the powerful Kostrzyn Fortress.
The landscape values of the Park make it a splendid place for tourists. Ornithologists and nature-lovers are mostly attracted by the broads of the Warta River. Numerous sightseeing walking routes and bicycle rides are organized in the Park. Their participants have a chance to learn about the unique flora and rare species of birds, e.g. bitterns, white-tailed eagles, Eurasian teals, corn crakes, tundra swans or black tern.