|North west look of the lake|
|Primary inflows||Begna, Urula|
|Surface area||37 km²|
|Max. depth||123 m|
|Water volume||13 km³|
|Surface elevation||150 m|
The rivers Begna from the valley of Begnadalen and Urula from the valley of Hedalen flow into the lake from the north. At south, a hydro-electric power station is located at Ringmoen. The lake is well known for its fisheries, and the lake is one of the few with a commercial fishery. Common species are whitefish, char, European perch and trout.
The name is derived from norse Sperðill which means "tale" and probably refers to the elongated form of the lake.
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