River Nordlingafljot is the discharge of several lakes in the moorland areas of Arnarvatnsheidi. It runs along the edge of a part of the 50 km long lava field Hallmundarhraun (Grahraun) until it spills into glacial River Hvita near the fascinating Lava Waterfalls. The surroundings of the river are very diverse, lava fields and vegetated areas. The lava field contains the longest and largest still discovered lava cave system of the country, Surtshellir. It is accessible by the same road as the fishing spots of River Nordlingafljot, just a bit further north-eastwards. A great number of ocean-reared salmon is released into the river every summer and the average size of the salmon caught there is 8-10 pounds. The average yearly catch has been 900 salmons and four rods are permitted per day. Some of the fishing spots have to be approached on foot over a flat and easy terrain.