Wakayama Hashimoto City
Enjoy an intensely hot sauna and an exceptional deep underground-water bath in an atmospheric space revived from a Meiji-era traditional house
"Kominka Sento - Koyaguchino Yu" is a day-use bathhouse in Hashimoto City, Wakayama Prefecture. In a charming space renovated from a Meiji-era traditional house, guests can enjoy baths filled with high-quality underground water drawn abundantly from below ground. Its intensely hot dry sauna with automatic löyly and the outdoor cold plunge bath, which reaches a maximum depth of approximately 1.4 m, are highly regarded. It also features an indoor carbonated spring and an outdoor medicinal bath that changes with the seasons, offering supreme totonou on the road.
An indoor bath tub filled with a luxurious high-concentration carbonated spring, wrapped in fine bubbles. Carbon dioxide is generously dissolved into the underground-water bath, making it easy to relax and enjoy a long soak at a pleasantly mild temperature. The delicate bubbles promote circulation, warm you deeply from within, and gently ease away daily fatigue and stiffness.
A richly atmospheric bath tub in the outdoor area. A variety of medicinal baths are offered, changing weekly or in line with seasonal events, along with unique collaboration baths using local specialties and trending beverages. Surrounded by the open air, pleasant scents, and high-quality underground-water baths, you can forget everyday life and unwind at a leisurely pace amid the charm of this historic town.
A compact yet heat-filled dry sauna that harmonizes with the atmosphere of a Meiji-era traditional house. Sauna stones are stacked inside, and automatic löyly fills the room with pleasant steam and gentle heat. The quiet interior, lit by calm indirect lighting and free of a TV, lets you quietly face your own body. The flow to the deep cold bath is also very smooth after working up a full sweat.
A deep cold plunge bath in the outdoor area, filled with natural underground water that rises abundantly from below ground. With a maximum depth of approximately 1.4 m, you can sink your whole body in deeply and cool down all at once. The still spring water, with no bubbles, lets you directly experience its mellow, gentle texture. Its crisp, refreshing coldness softly envelops the heat in your body and leads you to the finest outdoor air bath.
Irregular Holidays
Visited by the Editor-in-Chief
The Editor-in-Chief visited in person in September 2025
A second visit on the way back from Koyasan
Read the full review
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.
