Lundevatn, or Lundevatnet, is a lake on the borders between the municipalities of Lund (in Rogaland county) and Flekkefjord (in Agder county) in Norway. The village of Moi lies at the northern end of the lake and the smaller village of Åna-Sira lies just south of the southern end of the lake. The lake has a small dam at the southern end and it is used for the nearby Åna-Sira Power Station. The 27.49 km2 lake is about 25 km long. It is the ninth-deepest lake in Norway and extends about 265 m below sea level and since it sits at an elevation of 49 m, the maximum depth of the lake is 314 m. This overdeepening, as well as its long and narrow shape, are characteristics of glacially-formed lakes.