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The Biebrza National Park is located in Northeast Poland (Fig. 1) , in the basin of the river Biebrza. The park was established in 1993. It is the largest national park in Poland with a total area of 59,233 ha, of which 25,494 ha are wetlands. The Biebrza marshes, fens and wet meadows are famous particularly for their very diverse avifauna with many rare species, such as aquatic warbler (Acrocephalus paludicola) and greater spotted eagle (Clanga clanga). The park was designated as a wetlanddoi:10.21256/zhaw-20820 fatcat:sljsnhc3arfe7e5rpcwfc546xi