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

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