Silky natural hot spring from 1,000 m underground and a high-power strong sauna
Miyazaki Saito City
Located in Saito City, known for the Saitobaru Kofun Cluster, Saito Onsen prides itself on a natural hot spring of sodium bicarbonate spring water emerging from 1,000 m underground. The water feels remarkably slippery and silky, leaving skin smooth after bathing. The sauna is a spacious far-infrared dry sauna for about 20 people, set to 85°C–90°C but with very high power that delivers an intense, strong-style heat. After the sauna, guests can head to a generously sized cold plunge bath fed with abundant groundwater. This large super sento also offers a wide outdoor area and open-air relaxation space, as well as a variety of baths such as a waterfall bath, reclining bath, and more, ensuring a very satisfying experience.
TypeNatural Hot Spring
A sodium bicarbonate spring emerging from 1,000 m underground. The water has a slippery, silky texture that leaves skin smooth. The outdoor baths come in Japanese-style and Western-style, with the gender allocation alternating every Tuesday. The facility offers various ways to relax, including a waterfall bath, reclining bath, deep bath, and a radon hot spring.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity20people
A spacious far-infrared sauna with three-tier benches that fits about 20 people at once. Although the room temperature is set to 85°C–90°C, the stove is very powerful so the perceived heat is even higher, a strong-style experience. You can work up a good, heavy sweat while watching TV.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity10people
A relatively large cold plunge bath for about 10 people located just outside the sauna room. It is fed with abundant groundwater and the water temperature is set to a mild level. After the intensely hot sauna, you can soak slowly and for a long time to comfortably cool down.
Closed Days: None
1355-1 Chodono, Saito City, Miyazaki 881-0023, 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
Silky natural hot spring from 1,000 m underground and a high-power strong sauna
Miyazaki Saito City
Located in Saito City, known for the Saitobaru Kofun Cluster, Saito Onsen prides itself on a natural hot spring of sodium bicarbonate spring water emerging from 1,000 m underground. The water feels remarkably slippery and silky, leaving skin smooth after bathing. The sauna is a spacious far-infrared dry sauna for about 20 people, set to 85°C–90°C but with very high power that delivers an intense, strong-style heat. After the sauna, guests can head to a generously sized cold plunge bath fed with abundant groundwater. This large super sento also offers a wide outdoor area and open-air relaxation space, as well as a variety of baths such as a waterfall bath, reclining bath, and more, ensuring a very satisfying experience.
TypeNatural Hot Spring
A sodium bicarbonate spring emerging from 1,000 m underground. The water has a slippery, silky texture that leaves skin smooth. The outdoor baths come in Japanese-style and Western-style, with the gender allocation alternating every Tuesday. The facility offers various ways to relax, including a waterfall bath, reclining bath, deep bath, and a radon hot spring.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity20people
A spacious far-infrared sauna with three-tier benches that fits about 20 people at once. Although the room temperature is set to 85°C–90°C, the stove is very powerful so the perceived heat is even higher, a strong-style experience. You can work up a good, heavy sweat while watching TV.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity10people
A relatively large cold plunge bath for about 10 people located just outside the sauna room. It is fed with abundant groundwater and the water temperature is set to a mild level. After the intensely hot sauna, you can soak slowly and for a long time to comfortably cool down.
Closed Days: None
1355-1 Chodono, Saito City, Miyazaki 881-0023, 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