Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Minara Tennen Onsen; Riraku welcomes bathers in Tōon, Ehime Prefecture. This sodium-chloride hot spring reaches the surface at 40°C, feeding an indoor bath, an open-air rotenburo and a sauna.
Insider tip — Toon city (東温市) immediately east of Matsuyama preserves the agricultural and forested character of the Kamo River valley, where kaki (persimmon) orchards, sumo wrestling tradition (the Kinkoku stable has trained notable wrestlers), and the Omogo Valley mountains create a distinctly rural Ehime identity. 'Riraku' (relaxation) onsen draws natural springs from the Toon basin aquifer, offering a more intimate alternative to Matsuyama's famous bath district. The Omogo Valley hiking trails into the Shikoku mountain interior begin just above the city.