Hammersø, or Hammer Sø, is the largest lake on the island of Bornholm and the only 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.
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Address 3770, Denmark
Coordinates 55°16'59.117" N 14°45'56.369" E
