River Stóra-Laxá flows for about 90 km, from Lake Grænavatn down between Hrunamanna- and Gnúpverjahreppur, to the River Hvítá by Iða. It is a rain fed river, with about 512 km² catchment area. Stóra-Laxá is fishable far into the Laxárgljúfur gorge, which means that the landscape along it is both varied and magnificent. The river is divided into 4 fishing sections with a total of 10 rods. Single days are sold for the river, from noon to noon. The average catch is about 1000 salmon, but in the summer of 2013, there was a record catch when 1764 salmon were landed.