Kerlingarfjöll is a 1,477 m (4,846 ft)) tall mountain range in Iceland situated in the Highlands of Iceland near the Kjölur highland road. They are part of a large tuya volcano system of 100 km2 (39 sq mi). The volcanic origin of these mountains is evidenced by the numerous hot springs and rivulets in the area, as well as red volcanic rhyolite stone the mountains are composed of. Minerals that have emerged from the hot springs also color the ground yellow, red and green.
The area was formerly known for its summer ski resort, but this was dismantled in 2000. From 2000 Kerlingarfjöll have been operated as a highland resort, offering accommodation and food services to the guests in the area.
It was on March 17 in 2017 that the Iceland Monitor wrote that Kerlingarfjöll Mountains and geothermal area were being turned into a nature reserve. Although parts of the place already had protection, after made into reserve, all the whole 367 square kilometres are to be under the protection of the state of Iceland. Earlier, there had been thoughts of using the 140 degree Celsius hot springs as a geothermal power plant. It had already been popular of course with hiking and the tourists.