Mamry (German: Mauersee, Lithuanian: Mauras) is a lake in the Masurian Lake District of Poland's Warmia-Mazury Province. It is the second largest lake in Poland, with an area of 104 km². Maximum depth is 44 m, average is 11 m.
|Location||Masurian Lake District|
|Surface area||104 km2 (40 sq mi)|
|Max. depth||44 m (144 ft)|
|Surface elevation||116 metres (381 ft)|
|Islands||33 (7 in Mamry proper)|
The lake bottom is diversified, with numerous depressions and shallows, while the northern part is considerably deeper, and the bottom is overgrown with raised vegetation and underwater meadows with horsetails. The shores of the lake are mostly low and marshy, partly overgrown with forest.
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In the past, the lakes of the Mamry complex formed separate bodies of water connected by streams. The water level in the lakes rose in the 16th - 17th centuries by several meters. The following factors contributed to the rise of the water level in the Mamry complex: the dam on the Węgorapa River (the mill), movements of the earth crust - post-glacial rebound in the northern part of the complex by 1 mm a year. The former road to the church from Kalu to Węgielsztyn, some Prussian settlements and cemeteries were under water.