Djúpavatn, Spákonuvatn and Grænavatn
Three lakes in the hyaloclastite Ice Age ridges Vesturháls and Sveifluháls, contain groundwater. Djúpavatn is partly a crater lake, close to Djúpavatnsleið road, Spákonuvatn crater lake to the Sogin-geosite and Grænavatn to a marked path across Sveifluháls.