The Obersee (Swiss Standard German pronunciation: [ˈoːbərzeː] , lit. 'Upper Lake') is the smaller of the two parts of Lake Zurich (Zürichsee), located upstream in the cantons of St. Gallen and Schwyz in Switzerland. It is almost completely separated from the lower (or main) part of Lake Zurich by the Hurden Peninsula, an Ice Age glacial moraine.
The lake is home to several species of birds, amphibians, fish and invertebrates. There are several protected areas (reeds, bogs, fens) along the lake's shores. Located in the Prealps (German: Voralpen), the lake is also a popular recreational area.
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