volcanic landscape of leirhnjukur, myvatn geothermal area in iceland, with turquoise sulfuric lake

area blue caldera circle cloud colorful crater crevasse europe field formation fumarole geology geothermal hot spring hverarapara hverir iceland icelandic krafla lake land landmark landscape leirhnjukur mineral mountain myvatn natural nature orange outdoor park red rock simmering smoke soil sulfur sulfurous sulphur tourist travel turquoise view volcanic volcano water sulfuric mountains background