Natural Hot Spring
TypeNatural Hot Spring
A wide variety of baths including a high-concentration carbonated spring (Ramune no Yu), the region-specific Koshu wine bath, and herbal medicinal baths using Kampo herbs.
A comprehensive spa resort featuring a variety of saunas and nano water
Yamanashi Fuefuki City
Located in Isawa-cho, Fuefuki City, Spa Land Hotel Naito is a comprehensive bathing facility where you can enjoy not only overnight stays but also extensive day-use bathing. The entire facility uses nano water, which has excellent moisturizing and penetration properties, making it gentle on the skin. It offers four distinctive saunas (dry, healing, salt, and steam), and after warming up you can cool down in a spacious cold plunge bath. There is also a wide variety of baths such as a Koshu wine bath and high-concentration carbonated springs.
TypeNatural Hot Spring
A wide variety of baths including a high-concentration carbonated spring (Ramune no Yu), the region-specific Koshu wine bath, and herbal medicinal baths using Kampo herbs.
Sauna TypeDry Sauna
Stove Typestone
Capacity30people
A spacious dry sauna at about 100°C. A stone-convection stove promotes thorough sweating.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity10people
A mild sauna using far-infrared heating to warm the body from the core.
Water Qualitytap
Capacity5people
A cold plunge bath using skin-friendly nano water. Seasonal touches such as menthol added in summer can also be enjoyed.
Closed Days: None
1690 Yokaichiba, Isawa-cho, Fuefuki City, Yamanashi 406-0032, 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 comprehensive spa resort featuring a variety of saunas and nano water
Yamanashi Fuefuki City
Located in Isawa-cho, Fuefuki City, Spa Land Hotel Naito is a comprehensive bathing facility where you can enjoy not only overnight stays but also extensive day-use bathing. The entire facility uses nano water, which has excellent moisturizing and penetration properties, making it gentle on the skin. It offers four distinctive saunas (dry, healing, salt, and steam), and after warming up you can cool down in a spacious cold plunge bath. There is also a wide variety of baths such as a Koshu wine bath and high-concentration carbonated springs.
TypeNatural Hot Spring
A wide variety of baths including a high-concentration carbonated spring (Ramune no Yu), the region-specific Koshu wine bath, and herbal medicinal baths using Kampo herbs.
Sauna TypeDry Sauna
Stove Typestone
Capacity30people
A spacious dry sauna at about 100°C. A stone-convection stove promotes thorough sweating.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity10people
A mild sauna using far-infrared heating to warm the body from the core.
Water Qualitytap
Capacity5people
A cold plunge bath using skin-friendly nano water. Seasonal touches such as menthol added in summer can also be enjoyed.
Closed Days: None
1690 Yokaichiba, Isawa-cho, Fuefuki City, Yamanashi 406-0032, 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