Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
Chlorurée sodique et sulfureuse mixte
Located in Semboku, Akita Prefecture, Japan, Nyuto Tsurunoyu is the oldest ryokan of the Nyuto hot springs, founded in 1638. The thermal spring features white, opaque milky water due to its high sulfur content. Visitors can relax and rejuvenate at this historic spa, which offers a unique blend of traditional Japanese hospitality and a soothing natural setting.
Insider tip — Tsurunoyu is the most iconic rustic onsen in Tohoku: outdoor rotenburo baths with milky-white water deep in the forest, thatched Edo-era wooden buildings, and a historic mixed bathing pool. In winter snow, the atmosphere is otherworldly — book your room well in advance as it fills up fast.