sulphur pieces on iozan (sulfur mountain) active volcano area, akan national park, hokkaido, japan

akan crag hot dangerous volcanic sulphur geothermal reserve power nature active volcano landscape scenery sulfur mountain fumarole hokkaido scenic rock beautiful view outdoor tourism kawayu iozan valley travel ainu japan crystal mt iou national landmark majestic famous place heat temperature mount io horizontal park erupting lava onsen social issues land steam dramatic kushiro town destinations