Mts Kverkfjoll(The Ogress Mountains) have not yet been researched thoroughly, but are considered among the largest central volcanoes of the country.  The first documented scientific visits to the area date back to 1875 and 1912.  Mr James Lord Watts, an Englishman, who was traversing the Vatnajokull glacier, mentions them in his book on the crossing.  He also witnessed the major eruption of Mts Dyngjufjoll at the same time.  In 1912, the surveyor J.P. Koch described Mts Kverkfjoll as a very volcanically active area.  After 1930 quite a few travellers and scientist visited the area and the knowledge about it increased steadily.  In 1970 the geology of the Krepputunga Area was roughly mapped and areal and infra red photographs have revealed some of the mysteries of the system.

River Jokulsa a Fjollum has been flooded by volcanic and geothermal activity of the system during the historical centuries, but sources on the matter are lacking.  It was not until January 2002 that a part of the mystery was solved, when a glacier locked lagoon east of the hut of the Glaciological Society in Mts Kverkfjoll was emptied and an unexpected winter flood was explained.

The name of the mountain massif is derived from the pass between its eastern and western ridges, which rise 1920 and 1860 m above sea level.  The volcanic fissure system of the area stretches more than 50 km to the northeast and some dozens of km toward southwest in the direction of the central volcano Grimsvotn under the ice cap.  This volcanic area is estimated to be 10-15 km wide.  The likelihood of a connection between those two volcanic systems is considerable, because the chemical likeness of the volcanic products of both is striking.

The landscapes of Krepputunga, the area between Rivers Jokulsa and Kreppa, is mostly barren and consists of hyaloclastite mountains and hills, Holocene crater rows and sand deserts.  Entering it is like leaving the real world.  The sole vegetated area, where there is sufficient water to sustain some flora, is called Hvannalindir.  South of it is a 20-25 kmē, historical lava field, where one of the few outlaws of the country, Mountain-Eyvind, built his primitive lodgings

Scientists consider the Kverkfjoll Area to be the easternmost volcanic system of the country although the great strato volcano Oraefajokull is still further east.  The ice cap covers large areas, which have not yet been researched and future discoveries might explain a lot more of the historical data, such as the flooding of River Jokulsa on Breidamerkursandur in the south and the smell of sulphur and ashes, which fell there in 1927.