acidic hot spring stream water with hydrochloric acid emitting steam in mountain valley at tamagawa onsen hot spring in japan

acid acidic active akita blue caldera canyon city crater danger emitting eruption fume gas geology geothermal heat hokutolite hot hydrochloric japan landscape mineral mountain nature onsen park river rock rocky rugged semboku smoke spring steam stone stratovolcano stream sulfurous tamagawa terrain thermal tohoku travel valley vapor volcanic volcano vulcan vulcano water wilderness