Recommended onsen in Nagano

1 picks ranked from onsen analysis-sheet data (official, verified and free-flowing sources prioritised)

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Yamashio-kan Sulphur Spring
Sulphur SpringChloride SpringInfo pending
Yamashio-kan
山塩館
Nagano Oshika, Shimoina District· 鹿塩の湯1号
Mountain Salt Spring of the Southern Alps

The Kashio no Yu No. 1 source draws seawater-strength brine from the heart of the Southern Alps, far from any coast, and the place name Kashio, "deer salt," is said to recall deer that gathered to lick the salty water. For generations this brine has been boiled down to make mountain salt. Its dense salts and gentle sulfur aroma wrap the body, letting warmth linger long after the bath. It soothes travelers who wish to steep quietly in a rare salt spring deep in a mountain village.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.9
0714
TEMP12.1℃
0℃50℃100℃
KEY MINERALS
Metaboric acid
175 mg/kg

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

Chloride ion
14840 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

Strontium ion
117 mg/kg

Extremely rare in Japan. Calcium-like astringent action that tightens the skin.

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About onsen in Nagano

The benefits of an onsen vary by spring type. Nagano has a wide variety of spring types, each with different characteristics. my Onsen Techo ranks the onsen best suited to your symptom and area based on analysis-sheet data, which is mandated for display under Article 18 of Japan's Hot Spring Act. Each onsen page shows mineral visualisations, bathing tips and booking options.