Vänern is the largest lake in Sweden, the largest lake in the European Union and the third-largest lake entirely in Europe after Ladoga and Onega in Russia. It is located in the provinces of Västergötland, Dalsland, and Värmland in the southwest of the country.
The southeastern part of the Vänern is a depression that appears to have come into being by erosion of Paleozoic-aged sedimentary rock during the Quaternary glaciation that reached to the area. This erosion would have re-exposed parts of the Sub-Cambrian peneplain. Because the southern and eastern shores are parts where the Sub-Cambrian peneplain gently tilts towards the north and west, respectively, the lake is rather shallow at this places. The western shore of the lake largely follows a fault scarp associated to Vänern-Göta Fault.
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