Totonou with the Fuji Mountain lava steam bath and a crisp cold plunge bath polished by binchotan charcoal
Kanagawa Sagamihara City
"Ofuro no Osama Machida Branch" is a day-trip hot spring facility in Sagamihara City, Kanagawa Prefecture, boasting a wide variety of baths and extensive amenities. The underground spring known as Unomori Onsen is a sodium bicarbonate spring that leaves the skin smooth and soft. In addition to the large Kings Sauna, the sauna area also features the Fuji Mountain Lava Steam Bath, said to be the first of its kind in Japan, where you can enjoy deep sweating from the far-infrared effects of lava. The cold plunge bath is thoughtfully designed, with water flowing down walls lined with binchotan charcoal, and its purifying effect creates a refreshingly clear water quality. Relaxing in the open-air outdoor area is also very pleasant, making it easy to refresh yourself and forget the noise and bustle of the city.
TypeNatural Hot Spring
A sodium bicarbonate spring, known as a bicarbonate spring that leaves the skin smooth and soft. The brownish water is excellent for keeping the body warm and moisturized, leaving you feeling hydrated after bathing. You can fully enjoy the rich natural hot spring benefits in the outdoor rock bath and the indoor bath.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity30people
A spacious, tiered tower-style sauna with multiple levels. Powerful heat fills the room evenly, warming the entire body efficiently. Because you can choose your preferred temperature zone by moving to a different level, both beginners and experienced sauna lovers can enjoy a satisfying sweat session. This is the main sauna, where you can relax and enjoy sauna time while watching TV.
Sauna TypeMist Sauna
Capacity6people
Japan's first steam sauna, lavishly using lava from Mount Fuji. Thanks to the powerful far-infrared effect emitted by the lava, you can warm up slowly and deeply from within even at a low temperature. The heat spreading with the steam gently wraps around the skin, bringing comfortable sweating and relaxation.
Water QualityCharcoal Filtered Water
Capacity6people
A carefully designed cold plunge bath where water flows down walls lined with binchotan charcoal. Thanks to the purifying and mineral-releasing effects of the charcoal, the water quality is astonishingly clear and smooth on the skin. Offering an exceptional cooling experience with a crisp chill softened by a gentle touch, it is one of the most popular facilities at the Machida branch.
Closed Days: None
〒252-0301 1-24-9 Unomori, Minami Ward, Sagamihara 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
Totonou with the Fuji Mountain lava steam bath and a crisp cold plunge bath polished by binchotan charcoal
Kanagawa Sagamihara City
"Ofuro no Osama Machida Branch" is a day-trip hot spring facility in Sagamihara City, Kanagawa Prefecture, boasting a wide variety of baths and extensive amenities. The underground spring known as Unomori Onsen is a sodium bicarbonate spring that leaves the skin smooth and soft. In addition to the large Kings Sauna, the sauna area also features the Fuji Mountain Lava Steam Bath, said to be the first of its kind in Japan, where you can enjoy deep sweating from the far-infrared effects of lava. The cold plunge bath is thoughtfully designed, with water flowing down walls lined with binchotan charcoal, and its purifying effect creates a refreshingly clear water quality. Relaxing in the open-air outdoor area is also very pleasant, making it easy to refresh yourself and forget the noise and bustle of the city.
TypeNatural Hot Spring
A sodium bicarbonate spring, known as a bicarbonate spring that leaves the skin smooth and soft. The brownish water is excellent for keeping the body warm and moisturized, leaving you feeling hydrated after bathing. You can fully enjoy the rich natural hot spring benefits in the outdoor rock bath and the indoor bath.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity30people
A spacious, tiered tower-style sauna with multiple levels. Powerful heat fills the room evenly, warming the entire body efficiently. Because you can choose your preferred temperature zone by moving to a different level, both beginners and experienced sauna lovers can enjoy a satisfying sweat session. This is the main sauna, where you can relax and enjoy sauna time while watching TV.
Sauna TypeMist Sauna
Capacity6people
Japan's first steam sauna, lavishly using lava from Mount Fuji. Thanks to the powerful far-infrared effect emitted by the lava, you can warm up slowly and deeply from within even at a low temperature. The heat spreading with the steam gently wraps around the skin, bringing comfortable sweating and relaxation.
Water QualityCharcoal Filtered Water
Capacity6people
A carefully designed cold plunge bath where water flows down walls lined with binchotan charcoal. Thanks to the purifying and mineral-releasing effects of the charcoal, the water quality is astonishingly clear and smooth on the skin. Offering an exceptional cooling experience with a crisp chill softened by a gentle touch, it is one of the most popular facilities at the Machida branch.
Closed Days: None
〒252-0301 1-24-9 Unomori, Minami Ward, Sagamihara 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