volcanic landscape of hverir, myvatn geothermal area in iceland, with craters, hot springs

area blue boiling colorful crack crater crevasse field fissure flood flow formation fumarole geology geothermal grey hole hot spring hverarapara hverir iceland icelandic lake land landmark landscape mineral mountain mud pot myvatn natural nature orange pool red river rock scenery simmering soil stone stream sulfur surface tourist vent volcanic water craters springs pools pots