The ice age epoch has had a big influence on how Denmark has looked like in the majority of the last 2,6 million years. It has been a Denmark that time after time has been frozen and covered by tundra or kilometre thick ice, which each time has rearranged the landscape until it looked like the Denmark, we know today.
The last ice age was called the Weichselian glaciation. it lasted approximately 1000,000 years. The ice only covered Denmark in periods of a couple of thousand years at a time. In the majority of the period, the country was free of ice, and the Southwestern part of Jutland was actually not covered in ice during the last ice age.