1) Lake of Östergötland County 
Vättern is the second largest lake (by surface area) in Sweden, after Vänern and the sixth largest lake in Europe. It is a long, finger-shaped body of fresh water in south central Sweden to the southeast of Vänern pointing at the tip of Scandinavia. ==Name== One of the etymologies for the name Vättern is from `vatten`, the Swedish word for w.....