Lake Mamry

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.

Lake Mamry
060727 Mamry panorama.jpg
Lake Mamry is located in Warmian-Masurian Voivodeship
Lake Mamry
Lake Mamry
LocationMasurian Lake District
Coordinates54°6′47″N 21°42′2.1″E / 54.11306°N 21.700583°E / 54.11306; 21.700583Coordinates: 54°6′47″N 21°42′2.1″E / 54.11306°N 21.700583°E / 54.11306; 21.700583
Primary outflowsAngrapa
Basin countriesPoland
Surface area104 km2 (40 sq mi)
Max. depth44 m (144 ft)
Surface elevation116 metres (381 ft)
Islands33 (7 in Mamry proper)
Masurian Canal
Łyna Rivers
Allenburg I
Allenburg II
Groß Allendorf
Russian-Polish Border
Klein Bajohren
Lower Fürstenau
Upper Fürstenau
Lake Mamry

It actually comprises six connected lakes: Mamry, Kirsajty, Kisajno, Dargin, Święcajty and Dobskie. Mamry features 33 islands, totalling 213 hectares, some of which are ornithological reserves.

Lake Mamry is a popular tourist destination. It is connected to the Pregolya and the Baltic Sea by the disused Masurian Canal. The largest town on the lake shore is Giżycko.

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.


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.