The Lungerersee (also spelled Lungernsee or Lungerensee) is a small natural lake in Obwalden, Switzerland which is named after the town Lungern on its shore. It is used as reservoir.
The lake was originally much larger, and covered a large part of the valley it is situated in. Starting in 1836, its level was lowered by 36 meters through an artificial drainage tunnel of 380 m length.
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