Øyarvatnet or Øyarvatn is a lake in Agder county, Norway. It sits on the border between the municipalities of Valle and Sirdal, about northeast of the village of Lunde in Sirdal and about west of Austad in Bygland. The lake is part of the Kvina river system. It is located just to the south of the lake Rosskreppfjorden, which flows into it. The dam at the south end of the lake keeps it at an elevation of . See also List of lakes in Aust-Agder List of lakes in Norway References Lakes of Agder Valle, Norway Sirdal