What is "sysenvatnet"

Sysenvatnet is a lake in the municipality of Eidfjord in Hordaland county, Norway. The lake lies at the north end of the Sysendalen valley, about east of the famous Vøringfossen waterfall. The lake is dammed on the south end by a large stone embankment, and the lake is used as the main reservoir for the Sima power station. The dam can be easily seen from the Norwegian National Road 7, which runs near the southern shore of the lake.