hverfjall crater of volcano in myvatn area in northern iceland

area ash attraction basalt burfellshraun cloud cloudy crater dimmuborgir geologic grey grjotagja highland hverfell hverfjall iceland icelandic krafla land landmark landscape lava leirhnjukur mountain myvatn natural nature north northern outdoor preserved pseudocraters scandinavia scandinavian scenery scenic sightseeing skutustadir sky stone system tourism trekking view volcanic volcanism volcano white