Lake Onefndavatn (The unnamed Lake) is situated at 565 m above sea level.Its area is 0,22 kmē, the greatest depth is
19 m, the volume 1,3 km, the average depth 8 m, the greatest length 0,8 km and the width
0,4 km. The catch has been fluctuating since 1994 and in 1998 it was 104 fishes.