boiling grey mud pot in hverir, myvatn geothermal area in north east iceland

area boiling bubbling clay colorful crack crater crevasse field fissure formation fumarole fumaroles geology geothermal grey hole hot spring hverarapara hverir iceland icelandic lake landmark landscape mineral mountain mud pot myvatn natural nature orange pond pool red rock simmering smoke soil solfataras steam sulfur sulphating sulphur vent volcanic water north east background