active sulphur vents at owakudani volcanic valley in hakone, kanagawa prefecture, japan.

volcano fuji pacific ring fire elemental industry mining chemical element steaming vapors vapours fumes brimstone yellow sulphuric gas natural hot boiling sulfur field sulphur geothermal geology mineral activity active vents owakudani station hell valley smoke steam volcanic mountain sengokuhara hakone ropeway japan lake ashi kanagawa ashigarashimo honshu asia nature rock thermal