Kerlingarfjöll is a beautiful rhyolite mountain range (1477 m; 4846 ft) on the Icelandic plateau, formed about 10,000 years ago. The mountain range is part of a large, 100 square km (39 square miles) volcanic system. In the midst of these reddish rhyolite hills, there are many hot springs and streams. Minerals, which have emerged from the hot springs, color the ground red, yellow, and green. The ridge pinnacles are topped with small glaciers.
Until 2000, there was a summer ski resort, which was later closed. On May 17, 2017, the Kerlingarfjöll area was declared a protected nature reserve. You can stay overnight and relax next to the mountain range at the Kerlingarfjöll Mountain Resort. It has a free parking lot and a restaurant.