This 396 meter (1,300 ft) high tephra explosion crater is located near the eastern shore of Lake Myvatn in northern Iceland. Resembling a black ash cone of mammoth proportions, you can walk up the steep slopes and around the crater’s rim for otherworldly and awesome view of the surrounding landscape.

The volcano, which is a part of the Krafla fissure swarm, erupted in 2500 BP and the crater is approcimately 1 km in diameter. Walking the steep slopes offers a great view of the Lake Myvatn area. 

Tepra from Hverfjall has been carried all of the surrounding area. During the eruption a landslide in the south part of the crater occured, which affected the round, part conical shape of the mountain. When Iceland was being settled there was eruption in Svörtuborgir, at the southern end of Namafjalla, around Hverfjall, which was nearly engulfed in the lava. At the same time an erupion occured in the slopes above nearby valley of Hlidardalur.  

Hiking to the top of Hverfjall mountain is popular. There are two paths, one from the northwest and the other from south. It is strictly forbidden to use other routes or leave the paths, due to fragility of the nature.