Askja is a large caldera complex in the Dyngjufjoll mountains of Iceland's central highlands north of Vatnajokull. Major volcanic activity occurred there in 1875, associated with the formation of Lake Oskjuvatn and the Viti explosion crater. The landscape is defined by calderas, lava, mountains and other evidence of powerful volcanism. Askja lies within Vatnajokull National Park and is accessible only during part of the year via highland roads. Visitors should check road, weather and national park information before travelling.
Fumaroles
Steam vents
Sulfur deposits
Parking
Viewpoint
Hike required
Marked trail
Safety barriers
Warning signs
Stay on marked paths
Geothermal features
A major volcanic caldera complex in Dyngjufjoll with Lake Oskjuvatn, Viti, lava and evidence of active volcanism and geothermal heat.
Safety
Highland conditions can be difficult and access is seasonal. Follow closures and information from Vatnajokull National Park.
Last verified 18 September 2026 Source