In Trölladyngja there are springs and a continuous transformation on a tract of land which lies east of Djúpavatn and west around Oddafell. The hot spring activity is rather dull, with two springs near Sogið; steam with some sulfur and hot spring craters below the ridges and hitaskellur in Oddafell.

There are craters and large cinder crater that lie above the above mentioned A-V skák. The transformation is mainly in Sogar where there is a large area transformed into clay. West of the ridges from Sogar in the south near Hverinn there is tuff which is also transformed, but nearly as much as in Sogar. There are two explosion craters from the Ice Age and water in some. Djúpavatn was formed this way too. Calcium deposits are also found in two areas. A heat strip with steam springs lies from Trölladyngja to Eldborg, north in Lambafell, and is also entirely one chasm.

The Hverinn is located in lava southwest of the Southwest end of Oddafell. Steam phenomenon with some sulfur can be found in lava formations and some steam is in the surrounding area. There nearby there is some silicone and cold spring holes in it. In Trölladyngja there are two boreholes, one with a spring chasm north under it, the other in spring area west under the ridges. Both are around 260°C high up, but decrease in temperature however the deeper holes reaches a high of 320°C at depth of two kilometers.