Kerlingarfjöll is a 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 . 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 of which the mountains are composed. Minerals that have emerged from the hot springs also color the ground yellow, red and green.