Bath
TypeNatural Hot Spring
A 100% free-flowing natural hot spring, hypotonic and weakly alkaline. Facilities also include a walking bath, an electric bath, and an open-air bath.
A hot spring inn with a scorching sauna and a natural cold plunge bath
Kumamoto Hitoyoshi City
Iwai Onsen Yunoyado Sagura is a hot spring inn with a free-flowing natural spring located in Hitoyoshi City. Day-trip bathing is available and the facility is very popular with locals. Its standout feature is an extremely hot dry sauna that reaches around 100°C. The deep natural cold plunge bath pairs perfectly with it, allowing guests to enjoy a thorough hot-cold contrast bathing experience.
TypeNatural Hot Spring
A 100% free-flowing natural hot spring, hypotonic and weakly alkaline. Facilities also include a walking bath, an electric bath, and an open-air bath.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity12people
A spacious three-tier dry sauna. Powerful heat from a gas stove creates intense heat, offering a scorching experience at around 100°C.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath with a depth of 80–110 cm. Filled with soft-feeling natural water, its mild chill gently envelops a heated body.
Closed Days: None
154-1 Nishimashita-machi, Hitoyoshi-shi, Kumamoto Prefecture 868-0072, 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
A hot spring inn with a scorching sauna and a natural cold plunge bath
Kumamoto Hitoyoshi City
Iwai Onsen Yunoyado Sagura is a hot spring inn with a free-flowing natural spring located in Hitoyoshi City. Day-trip bathing is available and the facility is very popular with locals. Its standout feature is an extremely hot dry sauna that reaches around 100°C. The deep natural cold plunge bath pairs perfectly with it, allowing guests to enjoy a thorough hot-cold contrast bathing experience.
TypeNatural Hot Spring
A 100% free-flowing natural hot spring, hypotonic and weakly alkaline. Facilities also include a walking bath, an electric bath, and an open-air bath.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity12people
A spacious three-tier dry sauna. Powerful heat from a gas stove creates intense heat, offering a scorching experience at around 100°C.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath with a depth of 80–110 cm. Filled with soft-feeling natural water, its mild chill gently envelops a heated body.
Closed Days: None
154-1 Nishimashita-machi, Hitoyoshi-shi, Kumamoto Prefecture 868-0072, 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