Hecla

In Iceland there is an active volcano called Hekla. Cumulatively, this volcano has produced one of the largest volumes of lava of any in the world in the last millennium, around eight cubic kilometres.
Here the hill on the left is called Hecla and with the cloud streaming away from it, it appears as an active volcano itself.
In Icelandic hekla is the word for a short hooded cloak, which may relate to the frequent cloud cover on the summit. That seems quite fanciful and I wonder if perhaps Old Norse há  kúla = 'high knob-like hill' might be a better bet.