Photo: Kentaro Ohno from Tokyo, Japan · CC BY 2.0 · Wikimedia Commons
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Shima Onsen
Shima Onsen is a hot spring town in Gunma, Japan. The water leaves the ground at 43–82°C, hot enough that it has to be cooled before anyone can get in. It measures pH 7.7 — mildly alkaline, the slippery kind. Officially the water is classed as chloride spring and sulfate spring. Its sources put out around 3,500 litres a minute.
The water here
Chloride spring
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Sulfate spring
Clear water with a faintly bitter taste. Known for holding heat.
The numbers
- Water temperature
- 43–82°C
- pH
- 7.7 (mildly alkaline)
- Discharge
- 3,500 litres a minute
- Address in Japanese
- / 吾妻郡中之条町
Figures from the town's Japanese Wikipedia article.
Where it is
36.6862, 138.7747 — open the map
Read more
English Wikipedia · Japanese Wikipedia
Other towns in Gunma
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.