A Yuzawa base where you can refresh yourself with a natural radium mineral spring, carbonated spring baths, and a sauna
Niigata Minamiuonuma City
"Yunoeki Yung Annex" is a business hotel with a natural hot spring in Yuzawa Town, Niigata Prefecture. Its large bath area offers a wide variety of tubs, including a "natural radium mineral spring," which is expected to help stimulate metabolism, and a "carbonated radium bath," where you can soak in comfort at a temperature close to body temperature. The sauna is set to around 90°C in a dry style, and after working up a good sweat, you can cool down in a refreshing cold plunge bath cooled by a chiller. From the open-air bath, you can enjoy the changing seasons of Yuzawa, making it an ideal relaxation spot for easing the fatigue of skiing and mountain climbing.
TypeArtificial Hot Spring
An artificial hot spring made with natural radium ore. Through the hormesis effect of trace radiation, it is expected to help activate metabolism and improve immune function. In addition to the indoor bath, there is also a carbonated radium bath with a thermoneutral temperature of around 36°C, making it suitable for long soaks.
Sauna TypeDry Sauna
Capacity8people
Characterized by its dry setting. In a moderately sized room, you can steadily face the heat and efficiently promote sweating. The clean and comfortable space makes it ideal for refreshing yourself after a long day.
Water QualityTap Water
Capacity2people
A cold plunge bath located right next to the sauna room, offering a crisp, pleasant chill. The water temperature changes with the season, and in winter it may feel even more bracingly cold. Alternate hot and cold bathing helps leave both body and mind feeling sharp and refreshed.
Closed Days: None
1022-1 Yuzawa, Yuzawa Town, Minamiuonuma District, Niigata 949-6101
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 Yuzawa base where you can refresh yourself with a natural radium mineral spring, carbonated spring baths, and a sauna
Niigata Minamiuonuma City
"Yunoeki Yung Annex" is a business hotel with a natural hot spring in Yuzawa Town, Niigata Prefecture. Its large bath area offers a wide variety of tubs, including a "natural radium mineral spring," which is expected to help stimulate metabolism, and a "carbonated radium bath," where you can soak in comfort at a temperature close to body temperature. The sauna is set to around 90°C in a dry style, and after working up a good sweat, you can cool down in a refreshing cold plunge bath cooled by a chiller. From the open-air bath, you can enjoy the changing seasons of Yuzawa, making it an ideal relaxation spot for easing the fatigue of skiing and mountain climbing.
TypeArtificial Hot Spring
An artificial hot spring made with natural radium ore. Through the hormesis effect of trace radiation, it is expected to help activate metabolism and improve immune function. In addition to the indoor bath, there is also a carbonated radium bath with a thermoneutral temperature of around 36°C, making it suitable for long soaks.
Sauna TypeDry Sauna
Capacity8people
Characterized by its dry setting. In a moderately sized room, you can steadily face the heat and efficiently promote sweating. The clean and comfortable space makes it ideal for refreshing yourself after a long day.
Water QualityTap Water
Capacity2people
A cold plunge bath located right next to the sauna room, offering a crisp, pleasant chill. The water temperature changes with the season, and in winter it may feel even more bracingly cold. Alternate hot and cold bathing helps leave both body and mind feeling sharp and refreshed.
Closed Days: None
1022-1 Yuzawa, Yuzawa Town, Minamiuonuma District, Niigata 949-6101
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