[1] Døndalen, which covers an area of 37 hectares (91 acres), is one of Bornholm's crack valleys cutting through the granite rock.

As part of the island's defences in the 16th century, earthworks were constructed at the bottom of the valley next to the shore.

[3] Half way up the valley, the brook known as Døndaleåen falls some 20 metres (66 ft), forming Denmark's largest waterfall.

The rocky banks on the northwestern side rise 25 metres (82 ft) to the Amtmandsstenen viewpoint which looks out over the Baltic Sea to Christiansø.

[4] Døndalen has several examples of birdlife, particularly in the spring with nightingales, blackcaps, garden warblers, treecreepers and chaffinches.

Trees include hornbeam, silver birch, ash, elm and hazel as well as several varieties of rowan.