splashing mud at krafla geothermal area, lake myvatn, iceland, europe

100 area boil boiling bubbling crater craters damp danger dangerous degrees europe fumaroles fumes geothermal grey high hiking hot hverir iceland krafla lake mud myvatn namaskard natural nature pool pools pots power solfataras splash splashing spring springs steam stink sulphure sulphurous temperature tourism travel warmth water well