("Midge lake") among the largest lakes in Iceland, 36.5 km2, altitude 277 m, with a very indented shoreline, almost cut into two halves by a long peninsula and islands.

Rather shallow, the average depth being 2.5 m, 4.5 m at its deepest, with lots of diatomite (kieselguhr) in the lakebed.

Many islands, islets and pseudocraters, rich plant life in the lake and around it.

A greater variety of birds, especially ducks, than anywhere else in Iceland, or even a large part of the world.

The lake abounds in trout and there is very good troutfishing. Lots of midges and hence the name.

The surrounding area is extremely beautiful with many interesting lavafields, geothermal heat in caves and canyons and steep mountains in the background.

In October 1999 three men were killed when they were hit by a storm while laying a fiber optic cable across the lake.