Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Higashimatsuyama Spa Plus serves the central Saitama city of Higashimatsuyama, whose position in the Musashino Plateau makes it part of the broad agricultural and residential middle ground of the prefecture that stretches between Tokyo's northern suburbs and the mountain rim of Chichibu. The city contains the ruins of Musashino Kokubunji, one of the provincial Buddhist temples established by Emperor Shomu in the 8th century at the height of the Nara state's effort to create a network of state-sponsored temples across all provinces of Japan, remnants of an imperial religious project that gives Higashimatsuyama an unexpected historical depth. The spa's mineral waters draw from Saitama's generous underground hydrothermal resources, providing therapeutic bathing that serves a community at the productive, if quieter, heart of one of Japan's most important agricultural prefectures.
Insider tip — Higashimatsuyama Spa Plus is a modern super-sento facility in central Saitama Prefecture, drawing sodium-chloride water from depth to fill a range of indoor and outdoor pools. The dark, mineral-rich water is typical of the Kanto basin deep thermal aquifer and is classified as moruton-sen (black spring) for its high organic content. The facility caters to suburban families and office workers seeking relaxation without traveling to mountain resort areas.