The National Park covers most of the mountainous region of Jotunheimen, including Hurrungane, but Utladalen and its surroundings are within Utladalen Landscape Protection Area. Geographically, it lies in both Innlandet and Vestland counties. Geologically the Jotunheimen is a Precambrian province. Glaciers have carved the hard gabbro rock massifs of the Jotunheimen, leaving numerous valleys and the many peaks.