The deepest lake in Poland is, of course, in Masuria, that is, in the beautiful land of “a thousand lakes”. This name is also not true because there are about 2,600 lakes in Masuria. Which of them is the deepest? The deepest lake in Masuria and all over Poland is Lake Hańcza. According to some studies, the lake is 113 meters deep. The second deepest lake in Poland in terms of depth is Drawsko lake, over 82 meters deep.