Kogen no Tennen Onsen; Tsutsuji no Yu
Tsumagoi, Gunma, Japan
.jpg?width=960)
- Location
- Tsumagoi, Gunma, 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
Kogen no Tennen Onsen, also known as Tsutsuji no Yu, is located in Tsumagoi, in the highlands of Gunma prefecture. Its sulfurous water emerges at 44°C with a pH of 6.5, alongside an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Tsutsuji no Yu, the azalea spring, colours the Tsumagoi highland plateau where Kusatsu volcanic energy warms the earth. The azalea bushes blaze scarlet each June, and in winter the plateau fills with snow for outstanding cross-country skiing before a warming soak in sulfurous spring water.
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.