Hammersø (

English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ide ...

: Hammer Lake), or Hammer Sø, is the largest lake on the island of

Bornholm Bornholm () is a Danish island in the Baltic Sea, to the east of the rest of Denmark, south of Sweden, northeast of Germany and north of Poland. Strategically located, Bornholm has been fought over for centuries. It has usually been ruled by ...

and the only tarn in Denmark. It is located in a valley in

Hammeren Hammeren (also Hammerknuden; meaning, "hammerhead-shaped crag of granite") is a protected area and promontory in Denmark on the northernmost point of Bornholm island. It projects into Sæne Bugt bay in the Baltic Sea. The area includes Hammersø ...

, 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.

Biology

References

Geography of Bornholm Lakes of Denmark {{CapitalDK-stub