Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Toei Onsen Hanamatsuri no Yu, in the village of Toei, Aichi Prefecture, draws iron-rich water at 42°C. The bathhouse includes an indoor bath, an outdoor bath (rotenburo) and a sauna.
Insider tip — Toei Onsen Hanamatsuri no Yu sits in the remote Toei district of southern Aichi, near the famous Hanamatsuri fire festival villages of the Oku-Mikawa highlands. The iron-rich thermal waters emerge at a robust temperature and carry the mineral warmth of deep mountain geology. The rural setting means visitor numbers are low even on weekends, offering a genuine off-the-beaten-path onsen experience. Local ryokan packages include mountain vegetable cuisine unique to this corner of Aichi prefecture.