kerio volcano crater lake on iceland.

area artist attraction basalt beautiful bjork blue boiling brown crater erupt erupting eruption europe european explosion famous flower fumarole fumaroles fumes gas geological geology geothermal green hot hverir iceland icelandic kerio krafla lake land landmark landscape lava mudpool mudpot natural nature nordic northern rock scenic singer singing song spring steaming stem stone sulfur sulphur thermal touristic tourists volcanic volcano water