Sheepbacks were created by the movement of glacial ice during the last ice age and are ubiquitous in Sörmland's landscape.
Since the end of the last ice age about 10,000 years ago, the land mass of Sweden has increased significantly due to land uplift.
Kettle holes are characteristic landforms of the post glacial landscape and can be found in Sörmland.
Giant's kettles - Geomorphological forms created in the end of the last glacial period
Why is the last ice age not over yet? Introduction into terms, timescale and impact of the last ice age.