River Hofsá in Vopnafjörður has its main source in the moorland south of Fossdalur. Into it flows the drainage of Sænautavatn, which is 67 km from the sea. Hofsá runs into Vopnafjörður close to the town. This is an ancient salmon river and those who visit once are usually very loyal to the river thereafter. Various rivers and streams flow into Hofsá and it is the largest river Sunnudalsá. There has always been some salmon fishing. The total catchment of Hofsá is 1100 m². It is fished for 2-3 days at a time. The average catch for the last 10 years is about 900 salmon.