ABOUT
About this spot
Embraced by the deep wilderness of Akita Prefecture, Tamagawa Onsen is a kind of holy land that every hot spring fan should visit at least once. Its most notable feature is its water, with a pH of 1.2, the most strongly acidic in Japan. Its flow rate is also the greatest in the country, at 9,000 liters per minute from a single source, and the sight is truly overwhelming. Walk the promenade through the volcanic steam area and you will be wrapped in billowing white steam and the scent of sulfur, feeling the powerful energy of the earth on your skin. Especially famous is the natural bedrock bathing that uses geothermal heat. Lie down on a mat spread over the rocks and your body warms slowly from the core, delivering the ultimate detox experience. It is ideal for solo travelers seeking to refresh body and mind, or for trips with health-conscious friends and family. Why not forget the hustle and bustle of the city and spend a special moment of healing in this place of striking otherworldliness? * The water is highly acidic, so please follow the on-site guidance carefully when bathing.
Last updated March 28, 2026