Lake Alftavatn is actually a part of the river
Sog, the 19 km long discharge of Lake Thingvallavatn. It has an area of 2,2 km² and it is
accessible by roads on both sides.
The catch consists of nice lake char, 1-6
pounders and large sea trout. The salmon runs through the lake but is seldom caught. The
lake has not been netted for a long time. Travellers used to ford the river there in spite
of the width of the lake. The distance from the capital is about 70 km.