Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Okinawa City Spa operates in Koza, a uniquely multicultural urban district that grew up alongside American military installations after World War II and became the birthplace of a distinctly Okinawan musical fusion — blending traditional sanshin with blues, jazz, and soul to create a rock scene unlike anything else in Japan. The streets of Koza still pulse with this musical heritage through live houses, murals, and festivals that celebrate the hybrid culture born of Okinawa's complex postwar identity. Soaking in the spa's mineral-rich waters offers a moment of calm at the center of a city whose restless creative energy continues to define one of Japan's most distinctive urban experiences.
Insider tip — Okinawa City (Koza) is the island's second-largest city with a distinctive multicultural character born of its long association with the adjacent US military base, resulting in a lively mix of Okinawan, American, and Latin influences particularly visible in its music scene. The city spa draws sodium-chloride geothermal water and serves primarily a local clientele looking for everyday relaxation rather than tourist-focused luxury. The nearby Koza Music Town and numerous live music venues make this an ideal place to combine an evening onsen with a night of traditional eisa drumming or rock music. Admission prices tend to be among the most affordable on the island.
