Relax in a beauty skin bath that feels like lotion, used throughout the facility, and in a authentic rocky sauna
Saitama Fukaya City
"Kokusaiji Natural Hot Spring Hana Hotel Fukaya & Spa (Beauty Skin Bath)" is a day-use hot spring facility in Fukaya, Saitama Prefecture, attached to the accommodations at Hana Hotel. The spring water, called Kokusaiji Onsen, gushes from 1,134m underground and is rich in sodium bicarbonate and metasilicic acid, earning a reputation as a "beauty skin bath" that moisturizes the skin and smooths its texture. Remarkably, this natural hot spring water is used in every bath, including the showers. The sauna area features two types of saunas: an authentic rocky sauna equipped with an automatic löyly function, and a salt sauna that further enhances the beauty benefits. With a comfortably tempered cold plunge bath and open-air bathing in the spacious outdoor area, it is a blissful bathhouse where business and sightseeing fatigue can be deeply soothed.
TypeNatural Hot Spring
A simple hot spring that gushes from 1,134m underground. Rich in sodium bicarbonate and metasilicic acid, it is known for its lotion-like effect that removes old dead skin cells and moisturizes the skin. This luxurious spring water is used not only in the open-air bath and large public bath, but even in the showers.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity18people
An authentic rocky sauna equipped with an automatic löyly function. Steady heat fills the room, while periodic bursts of steam gently encourage comfortable sweating. In the spacious, wood-accented interior, you can warm yourself thoroughly and deeply from within.
Sauna TypeSalt Sauna
Capacity12people
A salt sauna with a medium-temperature setting that lets you warm up gradually. By rubbing the provided salt onto your body, you can combine its effects with the hot spring's beauty benefits to leave your skin even smoother. A relaxing space ideal for detox and beauty-focused use.
Water QualityTap Water
Capacity6people
A cold plunge bath located right next to the sauna. Its perfectly balanced temperature, not too cold, gently cools down your overheated body after sauna use. Suitable for everyone from beginners to experienced sauna-goers, it provides a comfortable environment to prepare for totonou.
Closed Days: None
〒366-0033 Saitama Prefecture, Fukaya City, Kokusaiji 510-1
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
Relax in a beauty skin bath that feels like lotion, used throughout the facility, and in a authentic rocky sauna
Saitama Fukaya City
"Kokusaiji Natural Hot Spring Hana Hotel Fukaya & Spa (Beauty Skin Bath)" is a day-use hot spring facility in Fukaya, Saitama Prefecture, attached to the accommodations at Hana Hotel. The spring water, called Kokusaiji Onsen, gushes from 1,134m underground and is rich in sodium bicarbonate and metasilicic acid, earning a reputation as a "beauty skin bath" that moisturizes the skin and smooths its texture. Remarkably, this natural hot spring water is used in every bath, including the showers. The sauna area features two types of saunas: an authentic rocky sauna equipped with an automatic löyly function, and a salt sauna that further enhances the beauty benefits. With a comfortably tempered cold plunge bath and open-air bathing in the spacious outdoor area, it is a blissful bathhouse where business and sightseeing fatigue can be deeply soothed.
TypeNatural Hot Spring
A simple hot spring that gushes from 1,134m underground. Rich in sodium bicarbonate and metasilicic acid, it is known for its lotion-like effect that removes old dead skin cells and moisturizes the skin. This luxurious spring water is used not only in the open-air bath and large public bath, but even in the showers.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity18people
An authentic rocky sauna equipped with an automatic löyly function. Steady heat fills the room, while periodic bursts of steam gently encourage comfortable sweating. In the spacious, wood-accented interior, you can warm yourself thoroughly and deeply from within.
Sauna TypeSalt Sauna
Capacity12people
A salt sauna with a medium-temperature setting that lets you warm up gradually. By rubbing the provided salt onto your body, you can combine its effects with the hot spring's beauty benefits to leave your skin even smoother. A relaxing space ideal for detox and beauty-focused use.
Water QualityTap Water
Capacity6people
A cold plunge bath located right next to the sauna. Its perfectly balanced temperature, not too cold, gently cools down your overheated body after sauna use. Suitable for everyone from beginners to experienced sauna-goers, it provides a comfortable environment to prepare for totonou.
Closed Days: None
〒366-0033 Saitama Prefecture, Fukaya City, Kokusaiji 510-1
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