These lakes are situated on the so-called Audkuluheidi. The eastern lake Fridmundarvotn has an area of 2,36 kmē, its greatest depth is 1,15 m and it lies 436 m above sea level. Its bottom is so muddy that it is impossible to wade into it.

The western lake Fridmundarvotn has an area of 6 kmē,  its greatest depth is 2,25 m and it is situated 441 m above sea level. Both lakes contain lake char and brown trout. They were both netted in earlier times. One of three main roads across the central highlands, Kjalvegur, passes very near the lakes. 

The distance from the capital is about 240 km by the Kjalvegur road.