Lake Constance (German: Bodensee) is a lake on the Rhine at the northern foot of the Alps, in Germany, Switzerland and Austria, and consists of three bodies of water: the Obersee (Upper Lake), the Untersee (Lower Lake), and a connecting stretch of the Rhine (Seerhein). The Rhine flows into it from the south, with its original course forming the Austro-Swiss frontier. Located at an altitude of 395m, it is 63km long, and at its widest point, nearly 14km. The greatest depth is 252m.
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