These two lakes belong to the moorland called Tvidaegra. They are very much alike. Lake Nautavatn has an area of 0,8 kmē and is located at 463 m above sea level. Lake Breidavatn has an area of 1,4 kmē and is located at 419 m above sea level. Both lakes are shallow, 1-2 m deep, and very little water enters them on the surface.

Their discharge, Breidavatnskvisl, runs through a few small lakes to the renowned salmon river Kjarra. The walking distance to the lakes is considerable. Both lakes contain lake char and brown trout. On the lakes there is a refuge hut and the number of fishing rods is not limited. 

The distance from the capital over the mountain pass Kaldidalur is about 190 km.