Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
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Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Located near the majestic Nachi Falls—Japan's tallest waterfall—and the UNESCO-listed Kumano Kodo pilgrimage trails, Nachikatsuura Marine Spa invites travelers to soak in sodium chloride-rich waters drawn from deep coastal geology along the rugged Kii Peninsula. The spa draws on the atmosphere of the Pacific seaboard, where mineral-laden thermal water is traditionally associated with relaxation and well-being after long days of walking. Guests can refresh after exploring the ancient cedar forests and sacred shrines of Kumano, making this marine onsen a fitting spiritual and physical terminus for the journey.
Insider tip — Nachikatsuura sits at the heart of the UNESCO Kumano Kodo pilgrimage trail, where bicarbonate waters have soothed walkers for centuries. The marine spa draws mineral-rich water from deep coastal strata, giving it a soft, silky feel on the skin. Visit at dawn when mist rolls off the Pacific and the forested Kii cliffs glow orange. Pair your soak with a boat tour to Nachi Falls, Japan's tallest waterfall, just minutes away.
