Hverfjall volcano crater at sunset, Myvatn, Iceland, Polar Regions

Hverfell (Hverfjall) ash crater in north of the country, Myvatyn (Myvatn) Nature Reserve, Iceland

Volcanic ash (tephra) crater Hverfjall (Hverfell), 140m deep, more than 1 km across, at Myvatn, northern Iceland, Iceland, Polar Regions

Panorama image of Hverfjall crater, Iceland, Polar Regions

Riders in front of on partly frozen lake Myvatn, volcanoes, Ludent, Hverfjall, Myvatn, Iceland, Europe

Tent in front of volcanic cone and lava, barren landscape, Vogar, Hverfjall, Myvatn, Iceland, Europe

A young woman dressed in black and wearing boots walks along the ridge of the Hverfjall crater with steam rising in the volcanic background.

A young woman dressed in black and wearing boots walks along the ridge of the Hverfjall crater with Lake Myvatn in the background.

The Hverfjall crater, a tephra cone or tuff ring volcano in Northern Iceland. The crater is approximately 1 kilometre in diameter; Skutustadahreppur, Northeastern Region, Iceland