Geirlandsá is without a doubt one of the best sea trout rivers in Iceland. First and foremost, anglers can expect to get very good sea trout, but also some salmon and char. The river is a 22 km long spring water fed river and originates in Geirlandsárbotnum, which is 500-600 m above sea level in the western highlands of Kaldbakur. Below Hagafoss, the river flows in beautiful gorges that widen as it descends, but there the river runs in curves at the gorge bottom and finally over the plains on gravel and sands.