Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Capabilities
Shared bathing area for all genders
Baths are gender-separated (women's rotenburo/changing room described); no mixed bathing mentioned.
Policies & Services
Welcomes children and families
Shower, wash stations, soap and shampoo provided
Relaxation space for after bathing
Lobby lounge with a manga corner (~5,000 volumes), free PC/printer.
On-site or nearby parking available
Views
LakeHighlights
Lukewarm BathAbout
Onyado Koisumi (おんやど鯉住) sits right on the shore of Lake Suwa, with an indoor bath and an outdoor rotenburo that the owner's grandfather built by hand. The alkaline spring water is gentle and smooth on the skin, kept on the mild side (guests report around 38 to 39 degrees), so it's easy to soak in for a long while. Baths are separated for men and women, and rooms facing the lake have a clear view of the water. It's a small, unpretentious inn: the lobby has a manga corner, and guests can borrow one of the inn's bicycles to ride along the lakeshore.
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Last updated August 5, 2026