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The Tungnafellsjökull volcanic system on the Central Iceland Volcanic Zone is a low activity system, in spite of its location in the central area of the Iceland hotspot, the last eruption being a small effusive eruption several thousand years ago.
Consisting of two central volcanoes Tungnafellsjökull and Hágöngur, and a fissure swarm, the Tungnafellsjökull system is about 55 km long and up to 15 km wide, rising to 1523 m. Tungnafellsjökull central volcano is partly covered by ice and has an ice-filled caldera. A second eccentric caldera, Vonarskarð, hosts a geothermal field.