Hammersø
| Hammersø | |
|---|---|
| Hammer Lake, Hammer Sø | |
Opalsø (right) and Hammersø (left) seen from Hammerknuden | |
| Location | Bornholm, Denmark |
| Coordinates | 55°16′58″N 14°45′54″E / 55.28278°N 14.76500°E |
| Type | Tarn |
| Max. length | 650 metres (2,130 ft) |
| Max. width | 150 metres (490 ft) |
| Surface area | 10.3 hectares (25 acres) |
| Max. depth | 13 metres (43 ft) |
.jpg){kind=link}
Hammersø (English: Hammer Lake), 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.