A serene forest garden wrapped in silence, offering healing in a sodium bicarbonate spring from 2,000 m underground
Saitama Fukaya City
"Hanayunomori Fukaya Hanazono Onsen" is a day-use bathing facility for adults, located in a quiet forest in Fukaya City, Saitama Prefecture. The sodium chloride spring that wells up from 2,000 m underground is rich in sodium bicarbonate and is known as a beautifying bath that leaves the skin smooth. Its appeal lies in the open, pure Japanese-style bathhouse with a 10 m-high ceiling and a spacious open-air garden where you can enjoy the changing colors of the four seasons. The sauna is a calm, TV-free space where you can face yourself while listening to Japanese music and classical music. With a cold plunge bath using "Yakushi no Reisen," which contains the same ingredients as the natural spring source, and outdoor bathing in the fresh air that lets you feel the breath of the forest, it offers blissful rest away from everyday life.
TypeNatural Hot Spring
A sodium chloride spring that wells up from 2,000 m underground. Rich in sodium bicarbonate, it is known for leaving the skin silky smooth after bathing. In the spacious open-air area’s rock bath, you can enjoy a luxurious hot-spring experience that feels united with nature through the seasons, such as spring cherry blossoms and autumn foliage.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
A calm sauna atmosphere with no TV, where Japanese music and classical music play quietly in the background. The temperature is set mildly at around 80°C to 90°C, and the far-infrared effect warms your body gradually from the core and encourages a pleasant sweat. You can look out at the scenery through the window and spend your own deeply relaxing time while feeling the stillness of the forest.
Water QualityHot Spring Water
Capacity6people
A cold plunge bath generously filled with Yakushi no Reisen, a mineral-rich alkaline ion water that springs from deep within the grounds. It contains sodium bicarbonate and is characterized by a soft, skin-adhering texture. The water temperature changes with the season.
Closed Days: None
888 Hitomi Yakushido, Fukaya City, Saitama 366-0811
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 serene forest garden wrapped in silence, offering healing in a sodium bicarbonate spring from 2,000 m underground
Saitama Fukaya City
"Hanayunomori Fukaya Hanazono Onsen" is a day-use bathing facility for adults, located in a quiet forest in Fukaya City, Saitama Prefecture. The sodium chloride spring that wells up from 2,000 m underground is rich in sodium bicarbonate and is known as a beautifying bath that leaves the skin smooth. Its appeal lies in the open, pure Japanese-style bathhouse with a 10 m-high ceiling and a spacious open-air garden where you can enjoy the changing colors of the four seasons. The sauna is a calm, TV-free space where you can face yourself while listening to Japanese music and classical music. With a cold plunge bath using "Yakushi no Reisen," which contains the same ingredients as the natural spring source, and outdoor bathing in the fresh air that lets you feel the breath of the forest, it offers blissful rest away from everyday life.
TypeNatural Hot Spring
A sodium chloride spring that wells up from 2,000 m underground. Rich in sodium bicarbonate, it is known for leaving the skin silky smooth after bathing. In the spacious open-air area’s rock bath, you can enjoy a luxurious hot-spring experience that feels united with nature through the seasons, such as spring cherry blossoms and autumn foliage.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
A calm sauna atmosphere with no TV, where Japanese music and classical music play quietly in the background. The temperature is set mildly at around 80°C to 90°C, and the far-infrared effect warms your body gradually from the core and encourages a pleasant sweat. You can look out at the scenery through the window and spend your own deeply relaxing time while feeling the stillness of the forest.
Water QualityHot Spring Water
Capacity6people
A cold plunge bath generously filled with Yakushi no Reisen, a mineral-rich alkaline ion water that springs from deep within the grounds. It contains sodium bicarbonate and is characterized by a soft, skin-adhering texture. The water temperature changes with the season.
Closed Days: None
888 Hitomi Yakushido, Fukaya City, Saitama 366-0811
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