Gravatn is a lake in Sirdal Municipality in Agder county, Norway. The lake is located about north of the small village of Lunde. The lake lies immediately south of the lake Valevatn, which flows out into Gravatn. The water in Gravatnis stopped by a dam on the south side. The water is regulated at an elevation of and it flows out through the small river Gravassåni which is a tributary of the big river Sira.
See also List of lakes in Norway
References