Koyahara Onsen Kumagai Ryokan
小屋原温泉 熊谷旅館こやはらおんせん くまがいりょかん
Carbonated spring ryokan in the forests below Mt. Sanbe
Day Use
NoIrregular holidays.
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Bathing Arrangements
A private bath you can reserve for yourself or your group
Shared bathing area for all genders
Policies & Services
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
Views
River
ForestAbout
Kumagai Ryokan sits in a quiet valley below Mt. Sanbe, with forest on all sides and a river just outside. The spring is carbonated and flows fresh without recirculation, producing a brownish, lightly cloudy water that coats the skin in small bubbles. The baths are all indoors and used as private kashikiri (貸切) sessions. The inn is small and accepts overnight guests only.
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Last updated September 19, 2026