turquoise hot boiling water in geyser in mountain valley at tamagawa onsen hot spring in semboku city, akita prefecture, tohoku

acidic activity adventure akita beautiful boiler boiling bubbles city ecology environmental eruption geology geothermal geyser green haze heat hot japan journey lake mist mountain natural nature onsen outdoors power prefecture river scenery scenic semboku sightseeing spring springs steam steamed steaming summer tamagawa thermal tohoku tourism travel turquoise valley vapour water wild