evidence: Lake Constance (in German, Bodensee) is the third largest lake in Central Europe after Lake Balaton and Lake Geneva. Since it was formed by the Rhine Glacier during the Ice Age, it is a glacial lake. Lake Constance has a total surface area of 571 km2 and is located 395 meters above sea level. The lake is located at the Northern foot of the Alps, on the border between Germany, Austria and Switzerland. Its shoreline belongs to the federal states of Bavaria and Baden-Wuttemberg in the German side, the federal state of Vorarlberg on the Austrian side, and the Swiss cantons of Thurgau, St. Gallen and Schaffhausen. The culminating point of the drainage basin of Lake Constance is the Todi, with an elevation of 3614 meters. Since the Rhine, the Bregenzer Ache and the Dornbirner Ache all carry sediments from the Alps into the lake, they are constantly, but gradually decreasing the lake’s depth and coastline extension on the southeastern end. [...] Lake Constance has four main parts: 476 km2 Obersee is the main section, Uberlinger See with a surface area of 61 km2 lies on the north, Untersee with 63 km2 is located on the west, whilst Zeller See and Gnadensee can be found on the northwestern part. The maximum depth of 252 meters can be found on the eastern part of the lake, in Obersee.