The Hverfell tephra crater on the edge of Lake Mývatn resulted from a violent and explosive eruption. At 180 meters, the crater rim provides a wonderful view.

 
 

Colin and Gwenn standing on the crater rim of Hverfell

View of Dimmuborgir from the crater rim of Hverfell

Looking north across the Hverfell crater

Gwenn and I on the windy crater rim. I'm pointing to dormant volcanic fissures