Zürichsee is the common name for the lower (Untersee) northwestern section of 68.2 square kilometres (26.3 sq mi), while the smaller southeastern upper (Obersee) lake area measures 20.8 square kilometres (8.0 sq mi), separated by the Seedamm causeway, a Molasse formation connecting Rapperswil with the Hurden peninsula. Before 1951 the annual water level fluctuated more than 1 metre (3.3 ft ... More @Wikipedia
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