Lake Skriðuvatn is at the top of Skriðdalur in S-Múlasýsla, is about 1.25 km² in size, deepest about 10 m, and lies at 155 m above sea level. The rivers Öxará, Forvaðará and Vatnsdalsá flow into the lake and from Skriðuvatn falls river Múlaá, which joins river Geitdalsá from Norðurdalur and after that the river is called Grímsá. There are quite a lot of good brown trout in Skriðuvatn, up to 5-pounds in weight. Arctic char is also caught there. It is preferable to fish with a fly in a lagoon that falls from the lake and into the river Múlaá.