Hvannadalshnjukur is Iceland's highest peak at 2110 meters (plus minus two meters perhaps depending on snow fall and drifting in different times of the year). It has been an increasingly popular peak to climb. Hvannadalshnjukur is actually a rather small knob of a mountain that stands up from the Oraefajokull glacier, a large central volcano and Vatnajokul's southernmost tip. The volcano is considered active, with the last eruption in 1727. It was relatively small, but a very large eruption occurred in 1362. Don't worry though, seismic measuring devices will probably tell that something is going on before the volcano wakes up again.