Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Kanaya Onsen Shizuoka is a traditional hot spring facility in the Kanaya area of Shimada, a historic city in central Shizuoka Prefecture, Japan, whose Kanaya district served generations of Edo-period travelers on the ancient Tōkaidō highway where the Ōigawa River — too swift for bridges — required crossing on the backs of porters, a unique and celebrated feature of old Japan's travel culture. The naturally chloride-sodium spring waters offer a deeply warming mineral soak valued for their fatigue-relieving and skin-softening properties, perpetuating a hot spring tradition that has comforted weary Tōkaidō travelers for centuries. Combining the deep historical layers of Japan's most famous highway with genuine geothermal wellness, Kanaya Onsen provides an exceptionally historically resonant thermal bathing experience.
Insider tip — Kanaya Onsen rises near the historic Tokaido post town on the banks of the Oi River, a crossing point that samurai and merchants navigated for centuries on the road between Edo and Kyoto. The sodium-chloride water at 43 °C is delightfully invigorating, and the restored Tokaido Museum in the center of town provides excellent historical context for the journey. The steam locomotive on the Oigawa Railway, departing from Kanaya Station, is a memorable side trip.
