Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Dogo Saya Onsen (Yurara Kazoku no Yu), in Matsuyama, Ehime Prefecture, draws iron-rich thermal water at 42°C, alongside an indoor bath, an open-air outdoor bath (rotenburo) and a sauna.
Insider tip — Dogo Saya Onsen Yurara Kazoku no Yu is a family-oriented bathhouse in the outskirts of Matsuyama, home of the famous Dogo Onsen, one of Japan's oldest hot springs. The iron-rich waters here offer a less touristy alternative to the celebrated Dogo main building, with spacious family bathing rooms. The mineral-laden water from Ehime's Shikoku terrains is valued for skin conditions and post-surgery recovery. A great choice for families seeking private baths away from busy tourist crowds.