Kerlingarfjöll is a 1,477 m (4,846 ft) tall volcanic massive in Iceland situated in the Highlands of Iceland near the Kjölur highland road.[1] It is usually regarded as part of a large tuya fissure system of 100 km2 (39 sq mi) in the southern portion of the Hofsjökull volcanic system, although is about 20–30 km (12–19 mi) in diameter itself, and is between 68 and 350 thousand years old predating some of the activity in the rest of the system. The volcanic origin of these mountains is evidenced by tholeiite basalt deposits, the numerous hot springs and rivulets in the area, as well as red volcanic rhyolite stone most marked near the two caldera.[2] Minerals that have emerged from the hot springs also color the ground yellow, red and green.

Hveravellir is a geothermal field (high temperature field) of the Oddnýjarhnjúkur-Langjökull volcanic system in the north of the Langjökull glacier. Hveravellir geothermal area is a small nature reserve and a tourist centre located at 600 m (2,000 ft) at the Kjölur mountain route between the glaciers Hofsjökull and Langjökull, in central Iceland. It is part of the Oddnýjarhnjúkur-Langjökull volcanic system. The place has been a popular resting place in highland travels since the age of settlement, 1100-1200 years ago. It is frequently mentioned in the old sagas, annals and folklore. Refuge huts have been situated there from the early beginning. The main geothermal activity is at the northern border of the large lava shield Kjalhraun

Geysir , sometimes known as The Great Geysir, is a geyser in south-western Iceland, that geological studies suggest started forming about 1150 CE. The English word geyser (a periodically spouting hot spring) derives from Geysir. The name Geysir itself is derived from the Icelandic verb geysa ("to go quickly forward"). Geysir lies in the Haukadalur valley on the slopes of Laugarfjall lava dome, which is also the home to Strokkur geyser about 50 metres (160 ft) to the south. The Strokkur geyser may be confused with it, and the geothermal field it is in is known usually as either, Geysir or Haukadalur. Eruptions at Geysir can typically hurl boiling water up to 60 m (200 ft) in the air. However, eruptions are nowadays infrequent, and have in the past stopped altogether for many years at a time.