The Müggelsee, also known as the Großer Müggelsee, is a natural lake in the eastern edge of Berlin, the capital city of Germany. It is the largest of the Berlin lakes by area, with an area of 7.4 square kilometres, a length of 4.3 kilometres The lake is in the Berlin district of Treptow-Köpenick. The suburbs of Köpenick, Friedrichshagen, Rahnsdorf and a little section of Müggelheim border on the lake. The lake itself is 8 metres deep at its deepest point. At its south end are hills called the 'Müggelberge', which are 115 metres high; they were formed during the Pleistocene. From Wikipedia