Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Take no Yu Jigokudani Onsen, also known as Yuka, is located in Oguni, Kumamoto Prefecture. Sulfurous water reaches around 48°C here, with an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Jigokudani Onsen; Yuka' (地獄谷温泉 — hell valley spring; 湯架 — bath deck) at Take no Yu in Oguni's Waita zone. 'Jigokudani' (hell valley) names the most intensely volcanic areas in Japan — where boiling mud pots, powerful steam vents, and scalding springs make the landscape appear literally infernal. The Waita Jigokudani is used for jigoku mushi geothermal steam cooking. The 'yuka' (elevated deck) allows visitors to observe and use the volcanic steam features while enjoying the extraordinary power of the Kuju volcanic system at very close range.