hell valley

active activity attention attraction bad badlands barren boil boiling bubble caldera color crater crust dangerous destination dramatic earthquake energy eruption explode explosion famous field fog fumarole fume gas geology geophysics geothermal geothermic geyser heat hole hot hotsprings japan jigokudani landmark landscape lava mineral minerals mud mudpot multicolored nature noboribetsu outdoors pool pot pots power rock scenery scenic sight sightseeing smell smoke spectacular spring springs steam sulfur sulphur temperature thermal tourism travel traveling valley vents vivid volcanic volcano volcanology water yellow