River Stóra-Laxá flows for about 90 km, from Lake Grænavatn down between Hrunamanna- and Gnúpverjahreppur, to River Hvítá by Iða. It is a rain fed 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 beats/sections with a total of 10 rods. Single days are sold in 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.
Stóra Laxá III is a fun two-rod beat that is ideal for small groups or good fishing companions. It can be challenging, but it is often very lively when increased power comes into the fishing in the autumn. One grilse per rod per day may be taken, but all salmon over 70 cm must be released