|Location||Southern Region, Iceland|
|Surface area||2.45 km2 (0.95 sq mi)|
|Max. depth||20 metres (66 ft)|
|Surface elevation||80 m (260 ft)|
Úlfljótsvatn (Úlfljótur's Lake or Ugly Wolf Lake) is a lake in southern Iceland, to the south of lake Þingvallavatn, 74km east of Reykjavík. Úlfljótsvatn is named after Úlfljótur, an important man who was involved in the Althingi (Icelandic Parliament) in 930.
In the vicinity, the Icelanders have many summer cottages.
The lake has an area of 2.45 km² and is situated at an altitude of 80 m. At the deepest point, Úlfljótsvatn is about 20 meters deep. The lake has a water area of 2.45 km² and is located directly south of the larger lake Þingvallavatn on the Sog river, which continues to Álftavatn.
Orkuveita Reykjavíkur bought the rights in 1929-1933 to generate electricity in the upper run of the Sog. In 1937, the Ljósafoss power station was then built, increasing the water level by about 1 metre.
To the east of the lake is road no. 36, southwest of road no. 360.
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