1) Lake of Buskerud 
Sperillen is a lake in Ådal, in the Ringerike municipality of the county of Buskerud, in Norway. The lake has an area of 37 km², is 108 meters deep at its deepest and lies at 150 meters above sea level. The rivers Begna from the valley of Begnadalen and Urula from the valley of Hedalen flow into the lake at the northern end, on either side of th...