Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
CalciumSulfatesMagnésium
Raima Onsen is a calcareous-simple thermal spring in Japan, its calcium-rich waters carrying the mineral compounds that contribute to the sustained post-bath glow valued in Japanese bathing tradition as the mark of a genuinely restful mineral soak. Calcareous springs are prized in Japanese bathing tradition for the lasting sense of warmth they impart, appreciated across the repeated soaks of the toji long-stay tradition. This spring's mineral combination of calcium richness with the gentle accessibility of simple alkaline water creates a bath that is both deeply soothing and universally welcoming across all ages.
Insider tip — Raima Onsen emerges in the coastal Asahi district of northeastern Toyama, where calcium-rich waters at 40°C carry trace minerals from the Hida mountain limestone belt before surfacing near the Japan Sea. The calcium content leaves a distinctive velvety texture on the skin and is locally recommended for bone health and sore joints. Facilities overlook the coast where the Oyashio current keeps summer air crisp, making the hot springs refreshing rather than oppressive. Fresh firefly squid from the Toyama Bay, a UNESCO Globally Important Agricultural Heritage site, is a natural companion to the post-bath meal.
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