Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Yuya 'Manyo Kurabu' is located in Tatsumi, Kōtō ward, Tokyo. Its sodium-chloride thermal water reaches 41°C (106°F). An indoor bath, an outdoor rotenburo bath and a sauna make up the facility.
Insider tip — Manyo Club facilities are Japan's premier large-format spa chains, blending ryokan aesthetics with comprehensive wellness offerings. The Kōtō location in Tokyo's bayside taps deep aquifers for the characteristic dark black water (kuro-yu) — rich in ancient sodium-chloride from Miocene sea sediments — and faces the reclaimed waterfront of Tokyo Bay. Open late into the night, it suits a post-dinner soak with the city skyline glowing across the water.