Wannsee is a locality in the southwestern Berlin borough of Steglitz-Zehlendorf, Germany. It is the westernmost locality of Berlin. In the quarter there are two lakes, the larger Großer Wannsee and the Kleiner Wannsee, located on the Havel and separated by the Wannsee Bridge. The larger of the two lakes covers an area of 2.7 km and has a maximum depth of …Wannsee is a locality in the southwestern Berlin borough of Steglitz-Zehlendorf, Germany. It is the westernmost locality of Berlin. In the quarter there are two lakes, the larger Großer Wannsee and the Kleiner Wannsee, located on the Havel and separated by the Wannsee Bridge. The larger of the two lakes covers an area of 2.7 km and has a maximum depth of 9 m.