Hammersø (English language, English: Hammer Lake), or Hammer Sø, is the largest lake on the island of Bornholm and the only Tarn (lake), tarn in Denmark.
It is located in a valley in Hammeren, the northernmost point of the island. A narrow isthmus separates the lake from Opalsø, an artificial lake formed in a granite quarry which was closed in 1970.
Geography
The lake is about long and wide, covering an area of , and reaches a maximum depth of . Its encatchment area is approximately , consisting of about 50% rocks, 25% forest and 25% cultivated land.
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Biology
References
Geography of Bornholm
Lakes of Denmark
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