Unzen Onsen Kojigoku Onsenkan
Unzen, Nagasaki, Japan
- Location
- Unzen, Nagasaki, Japan
- Water type
- sulfurous
- Temperature
- 44 °C
- pH
- 6.5
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Bio-active
LowHigh
Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Unzen Onsen Kojigoku Onsenkan, also in Unzen, Nagasaki, draws its sulfurous water from a spring at 44°C. An indoor bath, an outdoor rotenburo and a sauna are on offer.
Insider tip — Kojigoku Onsenkan, the small hell spring hall, takes its place among the named volcanic craters of Unzen where the 1991 Heisei Shinzan pyroclastic flows killed 43 people including volcanologists Katia and Maurice Krafft — the most deadly volcanic event in Japan modern era. The small hell designation is affectionate compared to the great jigoku hells nearby, and the spring water emerging at the edge of the active crater zone carries the distinctive sulfurous character of live volcanic discharge.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 44 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sulfurous water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.