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Hirugami Onsen

Nagano · 昼神温泉

Hirugami Onsen is a hot spring town in Nagano, Japan. It measures pH 9 — strongly alkaline. Officially the water is classed as sulfur spring.

Sulfur spring

The water here

Sulfur spring 硫黄泉

The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.

The numbers

pH
9 (strongly alkaline)
Address in Japanese
長野県下伊那郡阿智村

Figures from the town's Japanese Wikipedia article.

Where it is

35.4547, 137.7181 — open the map

Read more

Japanese Wikipedia

Other towns in Nagano

Bessho OnsenNagano · 別所温泉
Sulfur spring
Togura-Kamiyamada OnsenNagano · 戸倉上山田温泉
Sulfur spring
Shirahone OnsenNagano · 白骨温泉
Bicarbonate springSulfur spring
Kakeyu OnsenNagano · 鹿教湯温泉
Simple spring
Yudanaka-Shibu OnsenNagano · 湯田中渋温泉郷
Chloride springSulfate springSulfur spring
Nakabusa OnsenNagano · 中房温泉
Sulfur spring
Asama OnsenNagano · 浅間温泉
Simple spring
Hoshino OnsenNagano · 星野温泉
Chloride springBicarbonate spring

Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.