Lake Langavatn is in the Út-Fella water area and belongs to the farms Hafrafell, Krossi and Stafafell. It is only 10 km away from Egilsstaðir. The lake is 90 m above sea level and is estimated to be about 0.57 km² in area. Its maximum depth is 15 m. The inflow is from lake Reyðarvatn and Leirtjörn and from Langavatn a stream flows to lake Urriðavatn. Both brown trout and Arctic char are in the lake. At one time, large-scale net fishing was practiced in the lake, and when it was stopped, fishing in the lake deteriorated very much. Trout juveniles, caught in traps in streams near the lake, were then released. It seems to have worked well. Quite a bit of angling has been practiced in Langavatn, mainly with spinners and worms. Most of the fishing is in the first part of the summer and then again in the late summer. A common size of fish is one to two pounds, but up to four pounds fish have been caught in Langavatn. There is a nice road to the lake and turns into it shortly before reaching Staffell.