Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Toyotomi Onsen (Fureai Center), in the town of Toyotomi, Hokkaido, draws sodium-chloride water at 41°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Toyotomi Onsen Fureai Center sits in the flat agricultural plains of northern Hokkaido near the Sea of Japan coast, drawing sodium-chloride spring water that warms visitors against the area's formidable winters. The salt-rich water is highly saline by Hokkaido standards and known for its heat-retention properties, keeping the body warm long after emerging from the bath. The surrounding lavender fields, spectacular in July, make Toyotomi a popular base for flower-season travellers who round off long days of photography with an evening soak. The community-run centre embodies the welcoming spirit of rural Hokkaido.