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Kanagawa Yokohama City
Natural Hot Spring Mantennoyu in Yokohama City, Kanagawa Prefecture, is a day-use bathing facility where you can enjoy open-air baths with natural hot spring water from a private source, a tower sauna, a steam salt sauna, and a famous cold plunge bath scented with mint for alternating hot and cold baths. The outdoor baths use natural hot spring water for the rock bath and reclining bath, while the indoor baths offer a variety of functional baths. The sauna features an automatic löyly every hour, and the steam salt sauna offers a low-intensity sweating option. The facility also boasts a well-equipped dining area and relaxation services.
TypeNatural Hot Spring
The black water that springs from deep underground feels silky and soft upon contact with the skin, with a pleasant, enveloping slipperiness. The alkaline spring quality gently conditions the skin surface, leaving it moist and smooth after bathing. Immersing yourself in the rock bath and reclining bath in the open air, feeling the natural breeze, warms you from the core, allowing a peaceful time away from the city's hustle and bustle to flow slowly.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity30people
The hourly automatic löyly provides moderate humidification, enhancing refreshing sweating and thermal effects. The spacious room with tiered seating allows you to adjust to your preferred experience, and the design minimizes temperature loss from entering and exiting, maintaining stable conditions. Even in a short time, it warms you to the core, and alternating with outdoor air baths and the cold plunge bath offers a high level of refreshment.
Sauna TypeSalt Sauna
Stove TypeBuilt-in Stove
Capacity8people
A low-intensity heat bath filled with steam at around 50°C, allowing gentle sweating while minimizing strain on the heart and lungs. The salt care and high-humidity environment soften keratin, making it suitable for those who find dry saunas challenging, allowing for a thorough warming experience.
Water QualityTap Water
Capacity5people
Located in the flow line next to the sauna, the famous cold water bath scented with mint provides an instant cool down. Its refreshing coolness and pleasant skin feel quickly reduce post-sauna heat, promoting a state of perfect relaxation through circulation with outdoor air baths.
Closed Days: None
3-1-1 Kamihoshikawa, Hodogaya-ku, Yokohama-shi, Kanagawa
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—
Kanagawa Yokohama City
Natural Hot Spring Mantennoyu in Yokohama City, Kanagawa Prefecture, is a day-use bathing facility where you can enjoy open-air baths with natural hot spring water from a private source, a tower sauna, a steam salt sauna, and a famous cold plunge bath scented with mint for alternating hot and cold baths. The outdoor baths use natural hot spring water for the rock bath and reclining bath, while the indoor baths offer a variety of functional baths. The sauna features an automatic löyly every hour, and the steam salt sauna offers a low-intensity sweating option. The facility also boasts a well-equipped dining area and relaxation services.
TypeNatural Hot Spring
The black water that springs from deep underground feels silky and soft upon contact with the skin, with a pleasant, enveloping slipperiness. The alkaline spring quality gently conditions the skin surface, leaving it moist and smooth after bathing. Immersing yourself in the rock bath and reclining bath in the open air, feeling the natural breeze, warms you from the core, allowing a peaceful time away from the city's hustle and bustle to flow slowly.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity30people
The hourly automatic löyly provides moderate humidification, enhancing refreshing sweating and thermal effects. The spacious room with tiered seating allows you to adjust to your preferred experience, and the design minimizes temperature loss from entering and exiting, maintaining stable conditions. Even in a short time, it warms you to the core, and alternating with outdoor air baths and the cold plunge bath offers a high level of refreshment.
Sauna TypeSalt Sauna
Stove TypeBuilt-in Stove
Capacity8people
A low-intensity heat bath filled with steam at around 50°C, allowing gentle sweating while minimizing strain on the heart and lungs. The salt care and high-humidity environment soften keratin, making it suitable for those who find dry saunas challenging, allowing for a thorough warming experience.
Water QualityTap Water
Capacity5people
Located in the flow line next to the sauna, the famous cold water bath scented with mint provides an instant cool down. Its refreshing coolness and pleasant skin feel quickly reduce post-sauna heat, promoting a state of perfect relaxation through circulation with outdoor air baths.
Closed Days: None
3-1-1 Kamihoshikawa, Hodogaya-ku, Yokohama-shi, Kanagawa
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