Morskie Oko
In addition to the lake districts in the north (in Masuria, Pomerania, Kashubia, Lubuskie, and Greater Poland), there is also a large number of mountain lakes in the Tatras, of which the Morskie Oko is the largest in area. The lake with the greatest depth—of more than —is Lake Hańcza in the Wigry Lake District, east of Masuria in Podlaskie Voivodeship.