A spectacular open-air bath with sweeping views of Tokyo Bay and blissful outdoor air bathing in the sea breeze
Kanagawa Yokosuka City
"Yokosuka Onsen Yurak no Sato" is a day-use hot spring facility located along the Maborikaigan coastline in Yokosuka City, Kanagawa Prefecture, and is known for its stunning ocean view. In the observatory open-air bath, where you can soak while gazing at the breathtaking panorama of Tokyo Bay spread out before you, you can fully enjoy a sodium-iodide-chloride strong saline spring that wells up from underground. Rich in salt, the water has excellent heat-retaining properties and warms the body from the core. The sauna area includes two types: a high-temperature dry sauna that delivers intense heat, and a gentle salt sauna that is kind to the skin. After cooling down in the cold plunge bath, you can enjoy outdoor air bathing on the terrace, where the sea breeze blows pleasantly through, and experience an exceptional state of relaxation in a resort-like sense of openness.
TypeNatural Hot Spring
A sodium-iodide-chloride strong saline spring that wells up from underground. Because of its high salt content, it offers excellent heat-retaining and moisturizing effects, so after bathing the body stays warm and does not cool down easily. In the observatory open-air bath overlooking Tokyo Bay, you can fully enjoy this abundant natural blessing while listening to the sound of the waves.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity15people
A calm, three-tier sauna room. Thanks to far-infrared effects, heat gradually penetrates deep into the body, encouraging a refreshing sweat. It is spacious enough to relax while watching TV, and its steady heat is appealing to everyone from beginners to seasoned sauna enthusiasts. The cold plunge bath is located just outside the sauna room, making the flow of movement excellent.
Sauna TypeSalt Sauna
Capacity8people
A medium-temperature sauna where you rub salt onto your body before entering. By sweating thoroughly in moderate heat, the osmotic effect of the salt helps support the removal of impurities from the skin. After bathing, your skin is expected to feel smoother and more refined, making this a soothing space where you can enjoy both relaxation and beauty care.
Water QualityTap Water
Capacity4people
A pleasantly cool cold plunge bath located very close to the sauna room. It gently tightens a body warmed by the sauna and brings a refreshing sense of renewal. The clean bathtub supports a comfortable cool-down that leads naturally into outdoor air bathing while feeling the sea breeze afterward.
Closed Days: None
239-0801 4-1-23 Maborikaigan, Yokosuka 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
A spectacular open-air bath with sweeping views of Tokyo Bay and blissful outdoor air bathing in the sea breeze
Kanagawa Yokosuka City
"Yokosuka Onsen Yurak no Sato" is a day-use hot spring facility located along the Maborikaigan coastline in Yokosuka City, Kanagawa Prefecture, and is known for its stunning ocean view. In the observatory open-air bath, where you can soak while gazing at the breathtaking panorama of Tokyo Bay spread out before you, you can fully enjoy a sodium-iodide-chloride strong saline spring that wells up from underground. Rich in salt, the water has excellent heat-retaining properties and warms the body from the core. The sauna area includes two types: a high-temperature dry sauna that delivers intense heat, and a gentle salt sauna that is kind to the skin. After cooling down in the cold plunge bath, you can enjoy outdoor air bathing on the terrace, where the sea breeze blows pleasantly through, and experience an exceptional state of relaxation in a resort-like sense of openness.
TypeNatural Hot Spring
A sodium-iodide-chloride strong saline spring that wells up from underground. Because of its high salt content, it offers excellent heat-retaining and moisturizing effects, so after bathing the body stays warm and does not cool down easily. In the observatory open-air bath overlooking Tokyo Bay, you can fully enjoy this abundant natural blessing while listening to the sound of the waves.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity15people
A calm, three-tier sauna room. Thanks to far-infrared effects, heat gradually penetrates deep into the body, encouraging a refreshing sweat. It is spacious enough to relax while watching TV, and its steady heat is appealing to everyone from beginners to seasoned sauna enthusiasts. The cold plunge bath is located just outside the sauna room, making the flow of movement excellent.
Sauna TypeSalt Sauna
Capacity8people
A medium-temperature sauna where you rub salt onto your body before entering. By sweating thoroughly in moderate heat, the osmotic effect of the salt helps support the removal of impurities from the skin. After bathing, your skin is expected to feel smoother and more refined, making this a soothing space where you can enjoy both relaxation and beauty care.
Water QualityTap Water
Capacity4people
A pleasantly cool cold plunge bath located very close to the sauna room. It gently tightens a body warmed by the sauna and brings a refreshing sense of renewal. The clean bathtub supports a comfortable cool-down that leads naturally into outdoor air bathing while feeling the sea breeze afterward.
Closed Days: None
239-0801 4-1-23 Maborikaigan, Yokosuka 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