A dome-shaped automatic löyly sauna and a 100% natural groundwater cold plunge bath in perfect harmony
Kanagawa Atsugi City
"Natural Hot Spring Yukaraku Atsugi" is a day-use hot spring facility in Atsugi, Kanagawa Prefecture, distinguished by its strong focus on sauna and cold plunge bath experiences. In the open-air area, it features a rare dome-shaped Finnish sauna, where you can bask head to toe in enveloping heat and steam from the automatic löyly. Its biggest draw is the 100% natural groundwater cold plunge bath, drawn up and used as free-flowing water without going through a chiller or filtration. With a stable water temperature of around 18°C throughout the year, and the smooth feel unique to groundwater, it gently yet refreshingly cools and tightens the body after sauna use. The facility also offers a wide range of bathing experiences, including a natural simple hot spring, a high-concentration carbonated spring, and a barley stone mist sauna you can enjoy while lying down.
TypeNatural Hot Spring
A natural simple hot spring that is gentle on the skin. You can fully enjoy its rich benefits in baths such as the open-air bath, cypress bath, and combination baths with a high-concentration carbonated spring. The mild, unobtrusive water soothes everyday fatigue over time, and after bathing, a pleasant warmth lingers in both body and mind.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
A rare dome-shaped sauna room located in the open-air area. Frequent automatic löyly every hour at 00, 20, and 40 minutes keeps the room filled with pleasant humidity and heat at all times. The dome shape helps the steam circulate especially well, creating a sweating experience that gently yet powerfully envelops the entire body.
Sauna TypeMist Sauna
Capacity15people
A low-temperature mist sauna installed in the bath area, gentle on the skin and hair. Soft steam that makes use of the power of barley stone slowly eases both body and mind. Even those who are not fond of hot saunas can use it comfortably, making it a soothing space where you can relax while working up a gentle sweat.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
The groundwater is drawn up and used directly as luxurious free-flowing water without passing through a chiller or filtration system. Its greatest appeal is the mellow, smooth feel unique to groundwater, making it easy to enter even for those who are not fond of cold plunge baths. In a tub constantly fed with fresh water, it cleanly resets your overheated body after sauna use.
Closed Days: None
〒243-0816 Kanagawa Prefecture, Atsugi City, Hayashi 5-8-12
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 dome-shaped automatic löyly sauna and a 100% natural groundwater cold plunge bath in perfect harmony
Kanagawa Atsugi City
"Natural Hot Spring Yukaraku Atsugi" is a day-use hot spring facility in Atsugi, Kanagawa Prefecture, distinguished by its strong focus on sauna and cold plunge bath experiences. In the open-air area, it features a rare dome-shaped Finnish sauna, where you can bask head to toe in enveloping heat and steam from the automatic löyly. Its biggest draw is the 100% natural groundwater cold plunge bath, drawn up and used as free-flowing water without going through a chiller or filtration. With a stable water temperature of around 18°C throughout the year, and the smooth feel unique to groundwater, it gently yet refreshingly cools and tightens the body after sauna use. The facility also offers a wide range of bathing experiences, including a natural simple hot spring, a high-concentration carbonated spring, and a barley stone mist sauna you can enjoy while lying down.
TypeNatural Hot Spring
A natural simple hot spring that is gentle on the skin. You can fully enjoy its rich benefits in baths such as the open-air bath, cypress bath, and combination baths with a high-concentration carbonated spring. The mild, unobtrusive water soothes everyday fatigue over time, and after bathing, a pleasant warmth lingers in both body and mind.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
A rare dome-shaped sauna room located in the open-air area. Frequent automatic löyly every hour at 00, 20, and 40 minutes keeps the room filled with pleasant humidity and heat at all times. The dome shape helps the steam circulate especially well, creating a sweating experience that gently yet powerfully envelops the entire body.
Sauna TypeMist Sauna
Capacity15people
A low-temperature mist sauna installed in the bath area, gentle on the skin and hair. Soft steam that makes use of the power of barley stone slowly eases both body and mind. Even those who are not fond of hot saunas can use it comfortably, making it a soothing space where you can relax while working up a gentle sweat.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
The groundwater is drawn up and used directly as luxurious free-flowing water without passing through a chiller or filtration system. Its greatest appeal is the mellow, smooth feel unique to groundwater, making it easy to enter even for those who are not fond of cold plunge baths. In a tub constantly fed with fresh water, it cleanly resets your overheated body after sauna use.
Closed Days: None
〒243-0816 Kanagawa Prefecture, Atsugi City, Hayashi 5-8-12
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