|Location||Evje og Hornnes and
|Max. length||5 kilometres (3.1 mi)|
|Max. width||6 kilometres (3.7 mi)|
|Surface area||4.62 km2 (1.78 sq mi)|
|Shore length1||40.73 kilometres (25.31 mi)|
|Surface elevation||565 metres (1,854 ft)|
|1 Shore length is not a well-defined measure.|
Gyvatn is a lake in Norway. The lake straddles the borders of the three municipalities of Bygland and Evje og Hornnes (in Aust-Agder county) and Åseral (in Vest-Agder county). The 4.62-square-kilometre (1.78 sq mi) lake is located about 8 kilometres (5.0 mi) northwest of the village of Byglandsfjord and the lake Byglandsfjorden and it is about 7 kilometres (4.3 mi) east of the village of Åknes in Åseral.
- "Gyvatn" (in Norwegian). yr.no. Retrieved 2010-04-20.