The lakes within the Arnarvatnsheiði Fishing Association (northern part) and Tvídægra are numerous but are considered unequal fishing lakes. They are:
Arnarvatn stóra , Réttarvatn, Arfavatn, Þorvaldsvatn, Ketilvatn, Kvíslavötn. Hólmavatn (at Tungunni). Hólmavatn at Núpsheiði, Skálatjörn, Austur-Grandalón, Vestur-Grandalón, Tangalón, Strípalón and Þórhallalón.