Lake Mjoavatn has an area of 0,75 kmē. Its
greatest depth is 2,5 m and it is situated 208 m above sea level.
Mjoavatnslaekur, connects it with lake Stiflisdalsvatns. During dry spells, the road to
the lake is passable by car. The lake is surrounded by bogs. The catch is mainly brown
trout, 1-3 pounders. The lake is not netted.
The distance from the capital is about 35 km.