Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
acide chlorhydriqueSoufreRadonAluminiumFerSodium
Immerse yourself in the unique Tamagawa Onsen Akita experience, where radon-rich waters flow from a legacy source with a pH of 1.2, making it one of Japan's most acidic hot springs. Located in the mountains of Tohoku, this thermal spring offers a distinct blend of natural beauty and therapeutic relaxation. Guests can unwind in the warm, mineral-rich waters, rich in radioactivity, for an unforgettable experience.
Insider tip — Visitors lie on the rock slabs heated by geothermal energy for therapy. Longer than a traditional bath but very effective for pain.