A wetland bird sanctuary within the Wda Landscape Park
Miedzno Nature Reserve
Miedzno Nature Reserve is a small faunal (ornithological) reserve in northern Poland, established in 1968 to protect breeding and feeding grounds for waterbirds and marsh birds. It lies in the Kuyavian-Pomeranian Voivodeship, within Gmina Osie in Świecie County, and forms part of the larger Wdecki Landscape Park (Wda Landscape Park). The protected area covers roughly 88 hectares and is managed under active conservation status.
The reserve sits in the Bory Tucholskie mesoregion, a landscape historically dominated by extensive forests, peatland, and post-glacial lake systems. Its core feature is Lake Miedzno, a flow-through lake fed and drained by the Sobińska Struga river, which threads north to south through a peat-filled glacial channel tens to hundreds of meters wide. Surrounding the open water and peatlands are alder-birch swamp forests that connect the reserve to the broader woodland complex of the region.
Miedzno is recognized for the diversity and abundance of its breeding waterbird populations, including cranes, swans, ducks, and black storks, as well as rare raptors such as the white-tailed eagle. The reserve is also notable for supporting protected plants, including giant horsetail, early marsh orchid, bogbean, and a regionally significant population of one-flowered wintergreen, making it an important site for both avian and botanical conservation within northern Poland.