boiling mud source and geothermal structures at hverir area nearby lake myvatn and námafjall in iceland

travel destination regions northern environment protection engaged spray grey brown color summer tranquil tranquility idyllic landscape wing boiling mud source geothermal structures hverir area nearby lake myvatn námafjall fumarole fumerole volcano volcanic eruption adventure road-trip trip highlands gas sulfur oxide field activity sand carbon dioxide water steam heat superheat postvolcanic krafla system hverarönd vent orange yellow white background europe iceland