The Bovbjerg cliffs stretch for kilometers along the coast, but at Bovbjerg lighthouse the cliffs are at their highest and grandest. Where you are standing here it is 40 meters down to the beach. The cliffs are an impressive sight with sheer cliffs, deep chasms, "mountain peaks" and large landslides. The landscape is completely different from what is usually found in our flat country.
The strata in the cliff consist of clay, sand and gravel deposited under the Ice Age, when the ice masses spread several times from Scandinavia and down over Denmark. Under the Ice Ages, Denmark was covered by inland ice, just as Greenland is today. The last Ice Age (the Alternating Ice Age) ended about 12,000 years ago as the climate gradually warmed and the ice melted away. According to the tides, the sea "ate" the water, creating a steep slope where the layers of soil from the Ice Age became visible.
At Bovbjerg Lighthouse, the ice acted like a bulldozer, compressing the layers of earth. The originally horizontal layers have been folded and tilted, and a special hill section has been created where Bovbjerg Lighthouse stands today. This type of hill is called "edge moraine". The marginal moraines are places where the edge of the inland ice has pressed the lower masses together into prominent hills.