The blessings of ancient seawater rising from 1720 meters underground, with a full-fledged sauna featuring auto-löyly and a vast facility
Tokyo Katsushika City
"Tokyo Natural Hot Spring Kodaino-yu" is a large day-use hot spring facility in Katsushika Ward, Tokyo. Its "iodine-sodium chloride strong saline spring," which rises from 1720 meters underground, is rich in minerals found in ancient seawater and is said to offer excellent heat retention and beautifying effects for the skin. The sauna area features two types of saunas: a 90°C high-temperature sauna and a 45°C steam sauna. In the high-temperature sauna, auto-löyly is performed every 20 minutes, letting you enjoy powerful heat and invigorating perspiration. With spacious baths such as a hinoki bath and a three-tier open-air bath, it is an inviting place to relax at your own pace all day long.
TypeNatural Hot Spring
A strong saline spring containing minerals from ancient seawater, rising from 1720 meters underground. With its high salt content and outstanding heat-retaining effects, it is less likely to leave you chilled after bathing. You can enjoy its rich benefits and distinctive texture across a variety of baths, including a hinoki bath and a three-tier open-air bath.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
A high-temperature sauna room characterized by auto-löyly performed every 20 minutes. Hot steam is generated regularly, and the powerful heat envelops your entire body, promoting a high-quality sweat. With a spacious room equipped with a TV, you can refresh yourself while taking your time to face the heat.
Sauna TypeSteam Sauna
Capacity6people
A steam sauna with a gentle temperature setting that is easy on the body. The moist steam hydrates the skin and warms you gradually from deep within. It offers a soothing, enveloping relaxation experience that is different from the high-temperature sauna.
Water QualityTap Water
Capacity4people
A cold plunge bath that is ideal for cooling down after the sauna. The relatively mild temperature makes it easy for even those who are not fond of very cold water to immerse themselves comfortably. It gently calms the body temperature raised by the sauna and provides a pleasant step toward your subsequent outdoor air bath.
Closed Days: None
4-2-1 Okudo, Katsushika Ward, Tokyo 124-0022 Tokyo Natural Hot Spring Kodaino-yu
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
The blessings of ancient seawater rising from 1720 meters underground, with a full-fledged sauna featuring auto-löyly and a vast facility
Tokyo Katsushika City
"Tokyo Natural Hot Spring Kodaino-yu" is a large day-use hot spring facility in Katsushika Ward, Tokyo. Its "iodine-sodium chloride strong saline spring," which rises from 1720 meters underground, is rich in minerals found in ancient seawater and is said to offer excellent heat retention and beautifying effects for the skin. The sauna area features two types of saunas: a 90°C high-temperature sauna and a 45°C steam sauna. In the high-temperature sauna, auto-löyly is performed every 20 minutes, letting you enjoy powerful heat and invigorating perspiration. With spacious baths such as a hinoki bath and a three-tier open-air bath, it is an inviting place to relax at your own pace all day long.
TypeNatural Hot Spring
A strong saline spring containing minerals from ancient seawater, rising from 1720 meters underground. With its high salt content and outstanding heat-retaining effects, it is less likely to leave you chilled after bathing. You can enjoy its rich benefits and distinctive texture across a variety of baths, including a hinoki bath and a three-tier open-air bath.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
A high-temperature sauna room characterized by auto-löyly performed every 20 minutes. Hot steam is generated regularly, and the powerful heat envelops your entire body, promoting a high-quality sweat. With a spacious room equipped with a TV, you can refresh yourself while taking your time to face the heat.
Sauna TypeSteam Sauna
Capacity6people
A steam sauna with a gentle temperature setting that is easy on the body. The moist steam hydrates the skin and warms you gradually from deep within. It offers a soothing, enveloping relaxation experience that is different from the high-temperature sauna.
Water QualityTap Water
Capacity4people
A cold plunge bath that is ideal for cooling down after the sauna. The relatively mild temperature makes it easy for even those who are not fond of very cold water to immerse themselves comfortably. It gently calms the body temperature raised by the sauna and provides a pleasant step toward your subsequent outdoor air bath.
Closed Days: None
4-2-1 Okudo, Katsushika Ward, Tokyo 124-0022 Tokyo Natural Hot Spring Kodaino-yu
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