Within walking distance of Iyo City Station, featuring the golden spring that wells up from 1,000 meters underground and a Showa-era retro sauna space
Ehime Iyo City
Tennen no Yu Iyo Onsen is a day-use natural hot spring attached to Iyo Prince Hotel in Iyo City, Ehime Prefecture. The "golden spring" that wells up from 1,000 meters underground is beloved as a beauty bath because it contains abundant bicarbonate ions. The compact bathing facilities include a far-infrared sauna, a cold plunge bath, and an open-air bath. The sauna room plays radio instead of TV, and the homely, back-to-your-parents atmosphere is especially loved by local residents.
TypeNatural Hot Spring
A sodium bicarbonate hot spring that wells up from 1,000 meters underground. The water has a beautiful golden color that evokes ancient romance, and because it is rich in bicarbonate ions it is expected to leave the skin smooth, so it is commonly referred to as a beauty bath. In addition to indoor baths, a small open-air bath is also available.
Sauna TypeDry Sauna
Stove Typefar_infrared
A compact, calm dry sauna with a capacity of about 4 people. It uses a far-infrared gas stove, and the room temperature is set to 90°C–98°C so you can really feel the heat. There is no TV; instead radio (Nankai Broadcasting) plays as background music, creating a retro and pleasant atmosphere. A window provides natural light, so during the day you can sweat it out in a bright setting.
Water Qualitytap
A cold plunge bath located immediately outside the sauna room. The water temperature is around 18°C–19°C and the depth is approximately 40–60 cm. Although compact with a capacity of about 2 people, it cools the body effectively. After cooling down, you can enjoy a comfortable rest on the edge of the open-air bath or on chairs inside or outside the bathing area.
Closed Days: None
16-14 Nadacho, Iyo City, Ehime 799-3114, 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
Within walking distance of Iyo City Station, featuring the golden spring that wells up from 1,000 meters underground and a Showa-era retro sauna space
Ehime Iyo City
Tennen no Yu Iyo Onsen is a day-use natural hot spring attached to Iyo Prince Hotel in Iyo City, Ehime Prefecture. The "golden spring" that wells up from 1,000 meters underground is beloved as a beauty bath because it contains abundant bicarbonate ions. The compact bathing facilities include a far-infrared sauna, a cold plunge bath, and an open-air bath. The sauna room plays radio instead of TV, and the homely, back-to-your-parents atmosphere is especially loved by local residents.
TypeNatural Hot Spring
A sodium bicarbonate hot spring that wells up from 1,000 meters underground. The water has a beautiful golden color that evokes ancient romance, and because it is rich in bicarbonate ions it is expected to leave the skin smooth, so it is commonly referred to as a beauty bath. In addition to indoor baths, a small open-air bath is also available.
Sauna TypeDry Sauna
Stove Typefar_infrared
A compact, calm dry sauna with a capacity of about 4 people. It uses a far-infrared gas stove, and the room temperature is set to 90°C–98°C so you can really feel the heat. There is no TV; instead radio (Nankai Broadcasting) plays as background music, creating a retro and pleasant atmosphere. A window provides natural light, so during the day you can sweat it out in a bright setting.
Water Qualitytap
A cold plunge bath located immediately outside the sauna room. The water temperature is around 18°C–19°C and the depth is approximately 40–60 cm. Although compact with a capacity of about 2 people, it cools the body effectively. After cooling down, you can enjoy a comfortable rest on the edge of the open-air bath or on chairs inside or outside the bathing area.
Closed Days: None
16-14 Nadacho, Iyo City, Ehime 799-3114, 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