The soil is a sandy moraine, the last tip of the Salpausselkä ridge, and vegetation consists mainly of pine and low shrubs.
The latter is in turn part of a series of terminal moraines that runs from southern Norway through Dalsland, Skaraborg and Östergötland, continuing under the Baltic Sea into southern Finland and Russia as the Salpausselkä moraine which separates lakes Ladoga and Saimaa.