100% spring water natural radon hot spring and mist sauna
Kumamoto Yamaga City
A therapeutic-style onsen facility where you can enjoy a rare, high-concentration natural radon hot spring with water continuously flowing from the source. The radon mist sauna uses steam from the spring to create a misty sauna kept at a comfortable 40–50°C so you can warm up deeply without feeling breathless. After the sauna, you can enjoy the spring-fed, single-person Goemon cold plunge bath in the outdoor area. The facility also features a variety of baths such as a walking bath and waterfall massage (utase-yu).
TypeNatural Hot Spring
A natural radon hot spring that boasts one of the country's highest concentrations. Enjoy a variety of baths—hot bath, lukewarm bath, reclining bath, walking bath, and more—all supplied by continuous flow from the source.
Sauna TypeSteam Sauna
Capacity10people
A mist sauna where the radon hot spring source is atomized into a fine mist, keeping the room temperature at 40–50°C. It allows gentle, comfortable sweating without strain.
Water QualityHot Spring Water
Capacity1people
A single-person Goemon cold plunge bath in the outdoor area. It is continuously fed with spring water from the source, allowing a slow, relaxing cool-down.
Closed Days: None
2-5-9 Shikakodori, Yamaga City, Kumamoto Prefecture 861-0532, Japan
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
100% spring water natural radon hot spring and mist sauna
Kumamoto Yamaga City
A therapeutic-style onsen facility where you can enjoy a rare, high-concentration natural radon hot spring with water continuously flowing from the source. The radon mist sauna uses steam from the spring to create a misty sauna kept at a comfortable 40–50°C so you can warm up deeply without feeling breathless. After the sauna, you can enjoy the spring-fed, single-person Goemon cold plunge bath in the outdoor area. The facility also features a variety of baths such as a walking bath and waterfall massage (utase-yu).
TypeNatural Hot Spring
A natural radon hot spring that boasts one of the country's highest concentrations. Enjoy a variety of baths—hot bath, lukewarm bath, reclining bath, walking bath, and more—all supplied by continuous flow from the source.
Sauna TypeSteam Sauna
Capacity10people
A mist sauna where the radon hot spring source is atomized into a fine mist, keeping the room temperature at 40–50°C. It allows gentle, comfortable sweating without strain.
Water QualityHot Spring Water
Capacity1people
A single-person Goemon cold plunge bath in the outdoor area. It is continuously fed with spring water from the source, allowing a slow, relaxing cool-down.
Closed Days: None
2-5-9 Shikakodori, Yamaga City, Kumamoto Prefecture 861-0532, Japan
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more