Free-flowing source water from 1,503 m underground and an extra-cold cold plunge bath with a depth of 110 cm
Kanagawa Yokohama City
"Kohoku Natural Hot Spring Yuttari COco" is a spacious day-use onsen facility located inside a large commercial complex in Tsuzuki Ward, Yokohama City, Kanagawa Prefecture. Its greatest appeal is the chance to enjoy a brownish natural hot spring rich in salt, gushing from 1,503 m underground, and offered as a free-flowing source bath. The sauna is a Finnish-style sauna equipped with automatic löyly, where powerful waves of heat envelop the entire body. Especially noteworthy is the impressive cold-plunge selection, featuring two types: an extra-cold indoor bath with a depth of 110 cm, and an open-air milky cold plunge bath with fine bubbles that feel pleasantly soft. There is also a vast rest area with 30,000 manga volumes and Yogi Bo furniture, making it an urban oasis where you can spend the whole day in complete relaxation.
TypeNatural Hot Spring
A brown sodium-chloride strong saline spring, rich in salt, gushing from 1,503 m underground. Offered as a free-flowing source bath, the water is known for its excellent warming and moisturizing effects, and is said to warm the body deeply. Thanks to its mildly alkaline spring quality, it is also expected to help leave the skin smooth and soft, making it a luxurious gift of nature.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity16people
A full-fledged Finnish-style dry sauna. Regular automatic löyly raises the humidity inside by sending hot steam up from the sauna stones, quickly inducing a sweat. In the spacious room, you can enjoy an invigorating sauna experience while feeling the intense heat.
Sauna TypeMist Sauna
Capacity4people
A low-temperature sauna installed in the women’s bath area, enveloped in the scent of aroma. Its gentle warmth loosens both body and mind, allowing you to sweat slowly and thoroughly. With its highly relaxing effect, it is a soothing space recommended even for sauna beginners and those who do not enjoy intense heat.
Water QualityTap Water
Capacity4people
A deep cold plunge bath with a depth of 110 cm that fully envelops the body. With its sharply cold water temperature, it quickly cools down your overheated body after sauna use. Its appeal lies in the floating sensation unique to a deep tub and the overwhelming refreshment created by its powerful cooling effect.
Water QualityTap Water
Capacity6people
A silky-style cold plunge bath located in the open-air area, with fine bubbles mixed in. It feels exceptionally gentle on the skin, allowing you to cool down comfortably while enjoying the outdoor air. Because the water is not excessively cold, it is ideal when you want to cool your body gradually over time.
Closed Days: None
3F, Kohoku Minamo, 2-7-1 Nakagawa Chuo, Tsuzuki Ward, Yokohama City, Kanagawa Prefecture 224-0003
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
Free-flowing source water from 1,503 m underground and an extra-cold cold plunge bath with a depth of 110 cm
Kanagawa Yokohama City
"Kohoku Natural Hot Spring Yuttari COco" is a spacious day-use onsen facility located inside a large commercial complex in Tsuzuki Ward, Yokohama City, Kanagawa Prefecture. Its greatest appeal is the chance to enjoy a brownish natural hot spring rich in salt, gushing from 1,503 m underground, and offered as a free-flowing source bath. The sauna is a Finnish-style sauna equipped with automatic löyly, where powerful waves of heat envelop the entire body. Especially noteworthy is the impressive cold-plunge selection, featuring two types: an extra-cold indoor bath with a depth of 110 cm, and an open-air milky cold plunge bath with fine bubbles that feel pleasantly soft. There is also a vast rest area with 30,000 manga volumes and Yogi Bo furniture, making it an urban oasis where you can spend the whole day in complete relaxation.
TypeNatural Hot Spring
A brown sodium-chloride strong saline spring, rich in salt, gushing from 1,503 m underground. Offered as a free-flowing source bath, the water is known for its excellent warming and moisturizing effects, and is said to warm the body deeply. Thanks to its mildly alkaline spring quality, it is also expected to help leave the skin smooth and soft, making it a luxurious gift of nature.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity16people
A full-fledged Finnish-style dry sauna. Regular automatic löyly raises the humidity inside by sending hot steam up from the sauna stones, quickly inducing a sweat. In the spacious room, you can enjoy an invigorating sauna experience while feeling the intense heat.
Sauna TypeMist Sauna
Capacity4people
A low-temperature sauna installed in the women’s bath area, enveloped in the scent of aroma. Its gentle warmth loosens both body and mind, allowing you to sweat slowly and thoroughly. With its highly relaxing effect, it is a soothing space recommended even for sauna beginners and those who do not enjoy intense heat.
Water QualityTap Water
Capacity4people
A deep cold plunge bath with a depth of 110 cm that fully envelops the body. With its sharply cold water temperature, it quickly cools down your overheated body after sauna use. Its appeal lies in the floating sensation unique to a deep tub and the overwhelming refreshment created by its powerful cooling effect.
Water QualityTap Water
Capacity6people
A silky-style cold plunge bath located in the open-air area, with fine bubbles mixed in. It feels exceptionally gentle on the skin, allowing you to cool down comfortably while enjoying the outdoor air. Because the water is not excessively cold, it is ideal when you want to cool your body gradually over time.
Closed Days: None
3F, Kohoku Minamo, 2-7-1 Nakagawa Chuo, Tsuzuki Ward, Yokohama City, Kanagawa Prefecture 224-0003
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