Echo Valley is part of Bornholm's longest rift valley, which stretches from Saltuna in the east for 12 kilometers to Vallensgårds Mose. But it's actually even longer, as it stretches under the earth layer all the way to Arnager in the west. The valley is up to 70 meters wide and is bounded to the northwest by 20-meter-high vertical cliff walls.
The slopes are overgrown with over 200-year-old oak forest, which is under protection. The meadow in the Echo Valley is grazed by livestock, allowing visitors to view these spectacular rocks. Echo Valley is best known for the echoes that occur when sound bounces back from the steep rock walls.
The best place to hear the Echo Valley echo is at Hans Christian Spring, slightly to the left of the path.
Ekkodalen, and the other valleys on Bornholm, were formed by great tectonic stresses. The earth's crust cracked and created deep valleys. Rain and water washed away sediments and began to form visible vertical rock walls. The walls of the glacial rift valleys provide optimum protection from the wind and the valley floor has good conditions for plant growth: mild in winter and cool and shady in summer.
In 1809. Hans Rømer, to the dismay of the local peasants who had lost their right to graze freely, built an impressive stone wall around the forest, which still stands today. Hans Rømer served as a forester from 1800-36, creating the Almindingen forest, the third largest forest in Denmark. He also built the lattice-framed building Rømersdal, which is still the residence of the state forester.
Today the valley is used as a lush pasture for cows.
The best echo is obtained at Hans Christian Ørsted spring , about 20 metres to the left along the path at the entrance to Ekkodalen opposite Ekkodalshuset.
The spring was an ancient sacred well. Its very clear and tasty water was believed to be curative. In the 1920s and 1930s it was also called Ørsted's Radium Spring.