Luxuriate in the milky-white cloudy waters of Nakanosawa Onsen, which boasts one of Japan's largest spring outputs
Fukushima Inawashiro Town
"Bandai Meito Resort Bonari no Mori" is a hot spring resort in Inawashiro Town, Yama District, Fukushima Prefecture. Its greatest feature is the strongly acidic, milky-white cloudy water with a pH of 2.1, drawn from Numajiri Motoyu, which boasts one of the largest spring outputs in Japan. You can luxuriate in this celebrated spring water, known for its powerful sterilizing effect and skin-beautifying benefits, in an open-air bath where you can feel the forest and the sound of a clear stream. Each large bath area is equipped with an authentic dry sauna and a cold plunge bath, and alternating between hot and cold bathing while feeling the breath of nature will thoroughly melt away the fatigue of everyday life.
TypeNatural Hot Spring
A milky-white cloudy hot spring drawn from Numajiri Motoyu, which boasts one of the largest spring outputs in Japan. The distinctive texture created by its strongly acidic pH of 2.1, along with the scent of sulfur, heightens the atmosphere of an authentic hot spring. You can feel the full-body power of fresh source-fed water that only direct flow from the source can provide.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity6people
A dry sauna with strong heat, evoking the warmth of Nakanosawa Onsen. In the wood-warmed interior, you can slowly warm your body to the core. The natural view from the window adds a sense of openness to the sauna experience.
Water QualityTap Water
Capacity3people
A perfectly chilled cold plunge bath, ideal after warming up in the strongly acidic hot spring. Its skin-stinging coldness is pleasantly invigorating, allowing you to reset your mind and body at once. The pure water makes your post-sauna refresh complete.
Closed Days: None
2855-550 Koyama Numajiriyama, Inawashiro Town, Yama District, Fukushima 969-2752
Gender Access
Mixed Gender
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
Luxuriate in the milky-white cloudy waters of Nakanosawa Onsen, which boasts one of Japan's largest spring outputs
Fukushima Inawashiro Town
"Bandai Meito Resort Bonari no Mori" is a hot spring resort in Inawashiro Town, Yama District, Fukushima Prefecture. Its greatest feature is the strongly acidic, milky-white cloudy water with a pH of 2.1, drawn from Numajiri Motoyu, which boasts one of the largest spring outputs in Japan. You can luxuriate in this celebrated spring water, known for its powerful sterilizing effect and skin-beautifying benefits, in an open-air bath where you can feel the forest and the sound of a clear stream. Each large bath area is equipped with an authentic dry sauna and a cold plunge bath, and alternating between hot and cold bathing while feeling the breath of nature will thoroughly melt away the fatigue of everyday life.
TypeNatural Hot Spring
A milky-white cloudy hot spring drawn from Numajiri Motoyu, which boasts one of the largest spring outputs in Japan. The distinctive texture created by its strongly acidic pH of 2.1, along with the scent of sulfur, heightens the atmosphere of an authentic hot spring. You can feel the full-body power of fresh source-fed water that only direct flow from the source can provide.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity6people
A dry sauna with strong heat, evoking the warmth of Nakanosawa Onsen. In the wood-warmed interior, you can slowly warm your body to the core. The natural view from the window adds a sense of openness to the sauna experience.
Water QualityTap Water
Capacity3people
A perfectly chilled cold plunge bath, ideal after warming up in the strongly acidic hot spring. Its skin-stinging coldness is pleasantly invigorating, allowing you to reset your mind and body at once. The pure water makes your post-sauna refresh complete.
Closed Days: None
2855-550 Koyama Numajiriyama, Inawashiro Town, Yama District, Fukushima 969-2752
Gender Access
Mixed Gender
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