100% natural spring black bathwater
Kanagawa Yokohama City
Yokohama Natural Hot Spring Kusatsu is a full-fledged natural hot spring facility rooted in the local community, located in Minami Ward, Yokohama City, Kanagawa Prefecture. Its 100% natural spring water, known as black bathwater, gushes up from underground and is a sodium bicarbonate spring said to be highly effective for beautiful skin, with a uniquely smooth, silky feel. It is equipped with a dry sauna. The cold bath also uses the facility's luxurious black-bath mineral spring water, and cooling down while wrapped in the minerals of the hot spring is exceptional. In a clean and comfortable facility, you can forget the everyday bustle of the city and deeply soothe both body and mind.
TypeNatural Hot Spring
A brownish sodium bicarbonate spring that gushes up from underground. Committed to using 100% natural spring water, it is cherished as a beautiful-skin bath that leaves the skin smooth and soft thanks to its rich mineral content. It also has excellent heat-retention properties, so after bathing you can enjoy a pleasant warmth that lingers deep in the body. A renowned hot spring unique to Yokohama.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
An authentic Rocky-style sauna built with stacked sauna stones. Thanks to auto löyly performed every 10 minutes, the room is always filled with a pleasant level of humidity and heat. The steam gently envelops your whole body and efficiently promotes deep sweating. A popular facility at Kusatsu that men and women can enjoy on alternating days.
Water QualityHot Spring Water
Capacity2people
A luxurious cold bath that uses the facility's source spring water, black bathwater, in its raw mineral-spring form. It is characterized by a distinctive viscosity and smooth feel on the skin, derived from the hot spring minerals, and its not-too-cold water temperature lets you cool down slowly while fully feeling the benefits of the spring. An exceptional facility said to leave your skin silky smooth.
Closed Days: Monday
〒232-0051 21-29 Idogaya Kamicho, Minami Ward, Yokohama City, Kanagawa Prefecture
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
100% natural spring black bathwater
Kanagawa Yokohama City
Yokohama Natural Hot Spring Kusatsu is a full-fledged natural hot spring facility rooted in the local community, located in Minami Ward, Yokohama City, Kanagawa Prefecture. Its 100% natural spring water, known as black bathwater, gushes up from underground and is a sodium bicarbonate spring said to be highly effective for beautiful skin, with a uniquely smooth, silky feel. It is equipped with a dry sauna. The cold bath also uses the facility's luxurious black-bath mineral spring water, and cooling down while wrapped in the minerals of the hot spring is exceptional. In a clean and comfortable facility, you can forget the everyday bustle of the city and deeply soothe both body and mind.
TypeNatural Hot Spring
A brownish sodium bicarbonate spring that gushes up from underground. Committed to using 100% natural spring water, it is cherished as a beautiful-skin bath that leaves the skin smooth and soft thanks to its rich mineral content. It also has excellent heat-retention properties, so after bathing you can enjoy a pleasant warmth that lingers deep in the body. A renowned hot spring unique to Yokohama.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
An authentic Rocky-style sauna built with stacked sauna stones. Thanks to auto löyly performed every 10 minutes, the room is always filled with a pleasant level of humidity and heat. The steam gently envelops your whole body and efficiently promotes deep sweating. A popular facility at Kusatsu that men and women can enjoy on alternating days.
Water QualityHot Spring Water
Capacity2people
A luxurious cold bath that uses the facility's source spring water, black bathwater, in its raw mineral-spring form. It is characterized by a distinctive viscosity and smooth feel on the skin, derived from the hot spring minerals, and its not-too-cold water temperature lets you cool down slowly while fully feeling the benefits of the spring. An exceptional facility said to leave your skin silky smooth.
Closed Days: Monday
〒232-0051 21-29 Idogaya Kamicho, Minami Ward, Yokohama City, Kanagawa Prefecture
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