Ujście Warty
Poland's youngest national park — a made-for-birds floodplain where the Warta meets the Odra, arctic geese in the tens of thousands, and a German twin across the river.
Ujście Warty, created on 1 July 2001 and still Poland's youngest national park, protects the last eighty square kilometres of the Warta before it gives itself to the Odra at Kostrzyn. It is a park with almost no dry land in its job description: polders, wet meadows, oxbows and willow scrub, run on a water calendar of winter-into-spring flood and summer drawdown. The northern polder is kept on managed plumbing while the southern Słońsk basin still floods free, and the difference between the two — one a mosaic of hay meadows, the other a shallow seasonal lake — is the park's whole ecology in miniature. Directly across the Odra lies Germany's Unteres Odertal; the two parks bracket the confluence as one floodplain bird landscape with a border down the middle.
The numbers are the argument: more than 270 bird species recorded, with autumn roosts of bean and white-fronted geese in the tens of thousands, whooper swans wintering on the flooded grass, and cranes staging in noisy hundreds. Spring hands the meadows to breeding waders — lapwing, redshank, black-tailed godwit — and summer to colonies of whiskered terns nesting on floating vegetation, while white-tailed eagles work the whole year. The pedigree is older than the park: the Słońsk reserve held these polders from 1977, the Ramsar list took them in 1984, and since 2007 the entire park carries the wetland convention's designation.
This is also a deeply engineered landscape — the Warthebruch was diked, drained and colonised under Frederick the Great in the eighteenth century, and the park inherits its geometry of embankments and causeways. Visiting means the tops of those dikes: flat walking, easy cycling and long optics across country where the horizon is a line of poplars. At the confluence itself, Kostrzyn's razed old town — streets and cellars without houses, the "Pompeii on the Odra" — makes a sobering bookend to a day of geese.
What's worth knowing before you go
Słońsk is the natural base, with the park museum nearby at Chyrzyno; Kostrzyn nad Odrą has direct regional trains from Berlin and Gorzów, and a bicycle turns the park's distances into an asset. The classic transect is the Betonka, the old concrete causeway striking across the Słońsk basin — an out-and-back with birds on both sides the entire way.
Come between October and December for the goose spectacle and swan-grey floods, or in April for wader song over shining meadows; midsummer means mosquitoes and high grass, and spring water levels can close paths, so check before driving out. The connoisseur's hour is the last one of a November afternoon on the Betonka, when the geese lift off the roost in skeins that take whole minutes to pass.