Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Soraniwa Onsen is set in Osaka, within the busy Kansai urban area. Its sodium-chloride thermal water surfaces at 41°C, feeding an indoor bath, an outdoor rotenburo, and a sauna for a relaxing city stop.
Insider tip — Soraniwa Onsen (空庭温泉 — 'Sky Garden Onsen') is one of Osaka's most celebrated urban spas, a rooftop oasis near Osaka Station with large outdoor garden baths under the open sky. Drawing dark black water from Osaka's deep geological formations, the multi-level facility includes a variety of themed indoor and outdoor baths, restaurants and relaxation lounges — highly recommended for a full-day visit in Japan's most exuberant city.