Tokyo Hachioji City
A premium spa boasting Tokyo's first single cold plunge baths for both men and women and three types of carbonated springs
"Ryusenjinoyu Hachioji Minamino Branch" is one of the largest day-use bathing facilities in the Kanto region, located in Hachioji, Tokyo. It features a bazooka sauna that unleashes intense heat waves for both men and women, plus a Medi Sauna for men where you can enjoy self löyly, and an aroma salt sauna for women where clay packs are also available. It also offers exceptionally well-equipped cold plunge baths, including Tokyo's first single cold plunge baths for both men and women, at below 10 degrees, as well as the men's outdoor "Forest Cold Plunge Bath." After soothing your body in the natural hot spring that rises from 1,500 meters underground and the three high-concentration carbonated springs, you can relax at your leisure in forest villa, a stone spa area designed as a refined relaxation space for adults.

A large bathing area with 14 different types of baths, including the natural hot spring, an alkaline simple hot spring rising from 1,500 meters underground. Enjoy a varied bath-hopping experience with options such as the Tokyo-area's largest high-concentration carbonated spring, the reclining carbonated spring in the outdoor area, and the Miho no Tsubo bath, where countless bubbles envelop your whole body. This skin-smoothing beauty bath gently melts away the fatigue of everyday life.

Equipped with a powerful auto-löyly system called Bazooka that activates every hour on the hour and at 30 minutes past the hour. As soon as water is poured onto the sauna stones, hot air bursts forcefully from the vents and instantly fills the room with scorching steam. The waves of heat that wrap around your whole body encourage deep perspiration, letting both men and women experience the kind of powerful intensity that sauna fans will appreciate.

A men-only meditation sauna designed for stepping away from the noise of everyday life and quietly reconnecting with yourself. You can enjoy self löyly by pouring water onto the sauna stones at your own pace, while soft rising steam and a pleasant aroma fill the space. In the dim and calming environment, you can enjoy an immersive experience that deeply resets both body and mind.

A women-only sauna where salt and clay packs placed inside the room can be used freely. In a space filled with a rich aromatic fragrance, you can slowly warm your body while being enveloped in low-temperature steam. Gently rubbing salt or clay into open pores helps remove old dead skin cells and sebum, and after bathing you can feel your skin become astonishingly smooth.

A super-chilled cold plunge bath set to below 10 degrees, the first of its kind in Tokyo and available for both men and women. Its piercing, intensely cold water instantly tightens a body that has been heated to the limit in the sauna. By alternating with a regular cold plunge bath, you can experience an unprecedented burst of refreshment and a dynamic totonou sensation as if circulation is flowing throughout your entire body.

A newly installed, open-air cold plunge bath in the men's outdoor rotenburo area, with a depth of 90 cm. You can soak in it all the way up to your shoulders while feeling the outdoor air, cooling your entire body evenly. With convenient access from the Medi Sauna, this cool-down under the natural breeze offers a special kind of comfort that feels different from indoor baths.

A spacious area featuring seven types of stone spa, designed around the concept of a restorative space for adults. The aroma and the gentle warmth of far-infrared rays encourage a gradual, deep sweat from within. Between wellness sessions, you can spend your time however you like in the library with more than 10,000 books and comics, the coworking space where you can also work, or the semi-private log cabins.
Open Year-Round
Tokyo
A Kanto-area sauna hotel on a grand scale, with 4 types of sauna and 4 types of cold plunge bath
Tokyo
One of Kanto's largest spas where Tokyo's only "100 Famous Waters" spring and a natural hot spring shine
Tokyo
An urban spa featuring Japan's first tram sauna and a rare kelo sauna
JAPAN'S FINEST ONSEN & SAUNA
The Finest Onsen & Sauna in Japan
57 SELECTIONS
Most of what we surveyed never even made it onto this site. This book is a further cut from what did. Our editor bathed in every onsen and sauna in it, and wrote only what they confirmed on the ground.