Mamejima Onsen
TypeNatural Hot Spring
A sodium-calcium chloride spring. The water is colorless and clear with a slight salty taste and a faint sulfur odor, and it is a warming, good-heating spring.
A fully equipped facility with 13 types of baths and three kinds of saunas
Nagano Nagano City
Located in Mamejima, Nagano City, Natural Hot Spring Mamejima Yuttarien is a day-use hot spring facility on a spacious site offering 13 types of baths and three saunas. It features a high-temperature dry sauna, a low-temperature sauna that uses hot spring steam, a salt sauna, and a fully plumbed cold plunge bath kept around 15°C, providing a highly satisfying environment for sauna enthusiasts.
TypeNatural Hot Spring
A sodium-calcium chloride spring. The water is colorless and clear with a slight salty taste and a faint sulfur odor, and it is a warming, good-heating spring.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity20people
A far-infrared dry sauna that can accommodate more than 20 people. The lower bench is about 85°C while the upper bench reaches nearly 100°C, allowing you to sweat thoroughly at your preferred heat level.
Sauna TypeMist Sauna
Capacity5people
For men, a maifan-stone low-temperature sauna using hot spring steam at about 60–70°C; for women, a salt sauna at about 68°C.
Capacity5people
A flow-through cold plunge bath with water temperatures between 14.5 and 16.9°C. Charcoal bags are placed in the water for hygienic purposes, and the bath is sufficiently wide and deep for a thorough cool-down.
Closed Days: None
1641 Mamejima, Nagano City, Nagano 381-0022, 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 fully equipped facility with 13 types of baths and three kinds of saunas
Nagano Nagano City
Located in Mamejima, Nagano City, Natural Hot Spring Mamejima Yuttarien is a day-use hot spring facility on a spacious site offering 13 types of baths and three saunas. It features a high-temperature dry sauna, a low-temperature sauna that uses hot spring steam, a salt sauna, and a fully plumbed cold plunge bath kept around 15°C, providing a highly satisfying environment for sauna enthusiasts.
TypeNatural Hot Spring
A sodium-calcium chloride spring. The water is colorless and clear with a slight salty taste and a faint sulfur odor, and it is a warming, good-heating spring.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity20people
A far-infrared dry sauna that can accommodate more than 20 people. The lower bench is about 85°C while the upper bench reaches nearly 100°C, allowing you to sweat thoroughly at your preferred heat level.
Sauna TypeMist Sauna
Capacity5people
For men, a maifan-stone low-temperature sauna using hot spring steam at about 60–70°C; for women, a salt sauna at about 68°C.
Capacity5people
A flow-through cold plunge bath with water temperatures between 14.5 and 16.9°C. Charcoal bags are placed in the water for hygienic purposes, and the bath is sufficiently wide and deep for a thorough cool-down.
Closed Days: None
1641 Mamejima, Nagano City, Nagano 381-0022, 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