Until the 17th century, the island was covered with pine forest, which was lost due to deforestation. In its place, a heathland spread: Ørkenen, meaning "desert," extends over most of the island. Its unique feature is that the soil has not been cultivated since time immemorial, thus preserving its original glacial terrain. The area is sparsely vegetated, including heather, black crowberry, common larkspur, and lichens. Anholt boasts the largest contiguous lichen heathland in Europe. The developmental stages from crustose lichen to broadleaf lichen can be clearly observed here, with cup lichen, lungwort, and reindeer lichen being the main representatives. Of the island's 2,237 hectares, 2,067 hectares are protected.
Source: Wikipedia
Please note that driving and cycling are not permitted on the paths in "Ørkenen." The only way to visit the area is on foot.
If you walk all the way to the lighthouse, it's a good idea to bring water, as there is no access to water either along the trail or outside the lighthouse.