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The Koskowickie Lake, located to the north of the village of Legnickie Pole, is a unique sight in the landscape of the Land of Extinct Volcanoes. It is a natural reservoir which occupies a terrain depression within the rolling postglacial upland, with the lake level currently at 119 m a.s.l. The lake itself covers 55 ha, is 1 km long at maximum and up to 800 m wide. It consists of a larger western part and a smaller eastern embayment. The former southern embayment, extended towards the village of Koskowice, is now almost completely covered by reeds. Water depth is 3 m. The lake is part of the Kunickie Lakeland – the southernmost natural lakeland in Poland, of still not fully understood origin. Despite heavy anthropogenic impact the lake remains a significant natural site. In 2004 a nature reserve was declared, extending over 63.79 ha. Its main values include large rush communities, well developed marsh fern and common club-rush assemblages, the presence of about 20 species of fish and 30 species of breeding birds.
The long history of settlement is attested by the archaeological site of Grzybiany, belonging to the Lusatian culture from the Bronze Age and Early Iron Age. It is located on a peninsula projecting into the north-eastern shore. In the village of Koskowice, south of the lake, Saint Archangel Michael church was built in the 14th century, rebuilt in Classicist style in the mid-19th century.