A scenic outdoor air bath with the wind of the Tone River and natural hot springs
Gunma Numata City
"Jizo Onsen Yuniiku" is a spa resort located along the Tone River in Numata City, Gunma Prefecture. Its sodium chloride hot spring, which gushes up from underground, is known as the "hot water of warmth" for its excellent heat-retaining properties. It is equipped with a dry sauna and a salt sauna, and offers a wide variety of hot-and-cold contrast bathing experiences, including a crisply cold cold plunge bath and pot-shaped cold baths in the open-air area. Listening to the murmuring of the Tone River while enjoying outdoor air baths on the open and spacious deck chairs is truly a blissful moment.
TypeNatural Hot Spring
A sodium chloride hot spring that gushes up from underground. With alkaline properties, it has a gentle feel on the skin. Its strong heat-retaining effect warms you deeply from the core. From the open-air bath, you can take in the abundant natural beauty along the Tone River and fully savor the healing of this famous spring in a spacious, open setting.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
A dry sauna characterized by powerful heat. The spacious room lets you enjoy high-quality sweating. The flow from the sauna room straight to the open-air area is excellent, heightening the anticipation of totonou.
Sauna TypeSalt Sauna
Capacity6people
A gentle, low-temperature salt sauna located in the open-air area. Offered only on weekends, this space is ideal for those who want to work up a sweat slowly while using the power of salt to smooth and condition the skin. You can relax while wrapped in steam, and it is especially popular with sauna beginners and women. Be sure to experience how smooth your skin feels after bathing.
Water QualityTap Water
Capacity2people
A refreshing cold plunge bath whose crisp chill instantly tightens the entire body. Perfect for cooling down a heated body after a high-temperature sauna or aufguss. Though compact, it is deep enough to let you immerse up to your shoulders for a proper cooldown.
Closed Days: Wednesday
3435 Usune-cho, Numata City, Gunma 378-0031
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 scenic outdoor air bath with the wind of the Tone River and natural hot springs
Gunma Numata City
"Jizo Onsen Yuniiku" is a spa resort located along the Tone River in Numata City, Gunma Prefecture. Its sodium chloride hot spring, which gushes up from underground, is known as the "hot water of warmth" for its excellent heat-retaining properties. It is equipped with a dry sauna and a salt sauna, and offers a wide variety of hot-and-cold contrast bathing experiences, including a crisply cold cold plunge bath and pot-shaped cold baths in the open-air area. Listening to the murmuring of the Tone River while enjoying outdoor air baths on the open and spacious deck chairs is truly a blissful moment.
TypeNatural Hot Spring
A sodium chloride hot spring that gushes up from underground. With alkaline properties, it has a gentle feel on the skin. Its strong heat-retaining effect warms you deeply from the core. From the open-air bath, you can take in the abundant natural beauty along the Tone River and fully savor the healing of this famous spring in a spacious, open setting.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
A dry sauna characterized by powerful heat. The spacious room lets you enjoy high-quality sweating. The flow from the sauna room straight to the open-air area is excellent, heightening the anticipation of totonou.
Sauna TypeSalt Sauna
Capacity6people
A gentle, low-temperature salt sauna located in the open-air area. Offered only on weekends, this space is ideal for those who want to work up a sweat slowly while using the power of salt to smooth and condition the skin. You can relax while wrapped in steam, and it is especially popular with sauna beginners and women. Be sure to experience how smooth your skin feels after bathing.
Water QualityTap Water
Capacity2people
A refreshing cold plunge bath whose crisp chill instantly tightens the entire body. Perfect for cooling down a heated body after a high-temperature sauna or aufguss. Though compact, it is deep enough to let you immerse up to your shoulders for a proper cooldown.
Closed Days: Wednesday
3435 Usune-cho, Numata City, Gunma 378-0031
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