Der Lac de la Gruyère oder Greyerzersee ist ein Schweizer Stausee. Er befindet sich im Kanton Freiburg zwischen den Städten Bulle und Freiburg. Mit einer Seelänge von 13.5 km ist er der längste Speichersee der Schweiz. Im See befindet sich die Insel Ile d'Ogoz. Lake of Gruyère (French: Lac de la Gruyère; German: Lac de la Gruyère or Greyerzersee) is a lake in the La Gruyère region of the Canton of Fribourg, Switzerland. The reservoir was formed between the cities of Bulle and Fribourg, by building the Rossens Dam on the Sarine river in 1948. The arch dam has a height of 83 m and a crest length of 320 m. The reservoir filled in about four months after completion. The dam is operated by the Groupe E SA. The remains of the castle of Pont (or Pont-en-Ogoz) and a chapel are located on the Ile d'Ogoz, an islet in the lake. The "Viaduc du Lac de Gruyère" of the A12 motorway was built in the 1970s. The bridge has a total length of 2043 m and crosses three valleys, including two arms of the lake.en.wikipedia.org Lake ofGruyere...
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