Łańskie Lake - is a lake located in the Olsztyn Lake District, nearby the village of Łańsk, Gmina Stawiguda, Olsztyn County, Warmian-Masurian Voivodeship; in Poland. The lake is part of the Cedynia Landscape Park. Łańskie Lake is the seventeenth deepest lake in Poland. The Łyna River flows through the lake.