小野川温泉 吾妻荘おのがわおんせん あずまそう
A hillside ryokan with kakenagashi hot-spring baths in Onogawa Onsen
Adults pay 600 yen for day-use bathing; children age 1 and up pay 400 yen.
Uses natural hot spring water
Enclosed indoor bathing area
A private bath you can reserve for yourself or your group
Day visitors can book the private bath, not only overnight guests
Shared bathing area for all genders
Azumaso is a ryokan on a hillside above Onogawa Onsen, near Yonezawa, with kakenagashi (掛け流し) hot-spring water. The main indoor bath sits behind large windows that look onto a garden through the seasons, and the tub is built on the deep side for a proper soak. Guests can also reserve a private bath, and two of the room types each have their own onsen tub: the Azuma rooms a semi-open-air one, the other type an indoor one. A footbath sits in the courtyard, and day bathers are welcome too. The inn has been taking in bathers since 1789, when Onogawa was a toji (湯治) retreat, and it still has a homely, unhurried feel. Rooms look out over either the Azuma mountains or the onsen town below.
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Last updated September 26, 2026