A collection of our onsen data.
For each prefecture: a list of onsen towns, the breakdown of water types, day-trip baths, mountain onsen, and culture and heritage notes.
Search facilities that welcome day-trip bathers, by region and water type.
A small feature collecting only wild and hidden hot springs at the end of mountain trails.
A featured onsen town for each prefecture, with Wikipedia views, onsen-area counts, and hot-spring-source counts. Sortable by header, groupable by region.
Prefecture-representative onsen towns, ranked by annual Wikipedia views.
Onsen through legends, literature, geoparks, and Tsuge Yoshiharu's travelogues.
Definitions, characteristics, and effects of Japan's 8 main water types, based on the Ministry of the Environment's classification criteria.
A small feature on onsen buildings with cultural-heritage status, and onsen towns with unusual winter operating conditions.
See where each water type clusters geographically — sulfur springs concentrate around volcanic mountains.
A small feature classifying snow-country onsen by fame and accessibility, based on JMA official snow-depth normals.