Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Onsen Center Tenryo, in Hakusan (Ishikawa prefecture), draws bicarbonate water at 40°C. The center provides an indoor bath, an outdoor rotenburo bath, and a sauna in a neighborhood public-bath setting.
Insider tip — Onsen Center Tenryo takes its name from the tenryo (shogunate-governed territory) designation that protected the Shirakawa-Hakusan highland communities from feudal taxation during the Edo period. The surrounding mountain villages were among Japan most isolated communities until modern road construction — their winter populations reduced to the hardiest families who maintained the sacred pilgrimage infrastructure through snowfields of three metres and more from December to April, preserving a remarkable highland culture of self-sufficiency and religious devotion.