The name is likely related to an archaic word, esja, meaning rock flake or carving stone.

The movements of the plate boundaries cutting diagonally through Iceland are continually pushing the strata to the west and away from the active volcanic zone.

[2] Intrusions, i.e. large magma channels coming from the old central volcanoes at Kjalarnes and Stardalur [ˈstarˌtaːlʏr̥], found entrances into the strata.

An Icelandic writer in the 19th century, so goes the story, hoped to see the sun there after a long period of rain.

[3] After approximately 6.6 kilometers of walking and 597 meters altitude gain is a big rock called Steinn [ˈsteitn̥].

[3] From Þverfellshorn, reaching Hábunga requires another three-kilometer trek northeast, across a rocky plateau with no directional signs or clear path.