Lake Skjálftavatn is one of the largest lakes in the country, about 9 km² in area and lies at about m above sea level. This is shallow lake, only about 2 ~ 3 m a . The water was formed during earthquakes in 1975-6. In 1975 there were earthquakes in Kelduhverfi and landslides where they had just recovered. Then this historic lake was formed. From the lake, river Litlaá flows into the sea in Öxarfjörður. There is a lot of good fishing in Skjálftavatn; brown trout, sea trout and Arctic char. Among, good fishing spots are the springs at the so-called Jonnatún by Tjarnaleitisrétt.