Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Minamiku Onsen is a vibrant urban hot spring in the Minami Ward of Yokohama, Japan's second-largest city and the country's busiest port, a metropolis that played a pivotal role in Japan's modernization when it opened to foreign trade in 1859 and became the gateway through which Western culture, technology, and cuisine entered Japan. The chloride-rich mineral waters provide body-warming and skin-beneficial properties within a densely urban setting, serving Yokohama's large and cosmopolitan population with accessible thermal bathing. The neighborhood's proximity to Yokohama's historic Chinatown, Yamashita Park waterfront, and the distinctive Western-style mansions of the Bluff district adds considerable cultural richness to any visit.
Insider tip — Nestled in the southern wards of Yokohama, this urban bathhouse draws deep sodium-chloride water that softens skin and warms muscles after long city commutes. The brine content is typical of the Kanto plain aquifers, giving the water a slightly salty tang and excellent heat retention. Arrive on weekday mornings for the quietest experience; the regular neighborhood crowd thins out before noon.