Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Kii Nagashima Onsen Mie is a fishing village hot spring in the Kii Nagashima district of Mihama Town on the rugged Pacific coast of Mie Prefecture's Kii Peninsula, Japan, a remote and dramatically scenic area of deep bays, steep forested headlands, and traditional bonito fishing culture along the ancient Kumano pilgrimage coast. The naturally chloride-sodium spring waters offer a deeply warming saline mineral soak, characteristic of the Kii coastline's geothermal zone, prized for relieving the physical demands of maritime work and trekking the dramatic coastal trails. In one of Japan's most unspoiled coastal environments, far from major tourist infrastructure, Kii Nagashima Onsen provides an extraordinarily authentic and peaceful hot spring experience for travelers exploring the sacred, wild beauty of the Kii Peninsula.
Insider tip — Kii Nagashima Onsen sits where the Kii Mountains meet the Pacific on Mie's wild southern coast, an area famous for its deep-sea fishing and dramatic rocky shores. The very hot sodium-chloride water at 45 °C demands short plunges alternated with cool-down breaks, a local bathing rhythm the fishermen call kaidan-buro. The nearby morning fish market, open from 5 am, sells the catch that arrives through the night.