fumarole emitting smoke, fume and sulphur steam in mountain valley at tamagawa onsen hot spring in senboku city, akita prefecture

active akita caldera canyon city crater danger emitting eruption fumarole fume gas geology geothermal heat hot island japan landscape lava mineral mountain nature onsen park prefecture rock rocky rugged senboku smoke spring steam stone stratovolcano stromboli sulfur sulfurous sulphur tamagawa terrain thermal tohoku tourism travel valley vapor volcanic volcano vulcan vulcano wilderness yellow