Shima Seiryu no Yu
Shima Onsen, Nakanojō, Gunma, Japan
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- Location
- Shima Onsen, Nakanojō, Gunma, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 43 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Shima Seiryu no Yu sits in Shima Onsen, a traditional hot-spring district in Japan's Gunma prefecture. Its sodium-chloride water emerges at around 43°C. The bath house offers an indoor pool, an open-air outdoor bath (rotenburo) and a sauna, a classic setting for a Japanese onsen break.
Insider tip — Shima Onsen (四万温泉) is one of Gunma's most storied historic spa towns — the name '四万' (shima, meaning 40,000) refers to the tradition that these pure transparent waters can heal 40,000 human ailments. The Sekizenkan ryokan (1691) is Japan's oldest continuously operating hot spring inn and is widely believed to have inspired the bathhouse in Miyazaki's Spirited Away. The crystalline blue-green Shima River runs through the gorge town, its waters as clear as the onsen itself.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 43 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.