Licence
What you may do with what is here, and what we had to do to publish it.
Our own work
Original text and photographs on this site are © the site's authors, all rights reserved, unless a page says otherwise. Quoting a passage with a link back is fine and needs no permission.
Imported data
Coordinates and names imported in bulk come from Wikidata, which is CC0 — public domain, no share-alike. That choice is deliberate rather than incidental: OpenStreetMap's ODbL carries share-alike obligations that attach to the *database*, not just to individual records, and mixing ODbL geodata into this one would make the licence of the whole thing ambiguous.
Where OpenStreetMap data is used to fill a gap Wikidata cannot, it is recorded as such on /credits with the ODbL attribution the licence requires, and the specific facts it supplied are traceable per field.
No prose is imported from Wikipedia — not quoted, not paraphrased. Wikipedia text is CC BY-SA, and CC BY-SA is contagious to the page it lands on. Structured facts only.
Maps
Vector basemaps are served by OpenFreeMap from OpenStreetMap data, © OpenStreetMap contributors, ODbL.
Japanese topographic, aerial and hillshade tiles come from the Geospatial Information Authority of Japan (国土地理院) and are marked 出典：国土地理院 as their terms require. Where tiles are composited or adjusted for display, that constitutes 編集・加工 under those terms and is noted here.
Analysis certificates
Photographs of a facility's 温泉分析書 are reproduced as documentary evidence of the facts on them — a certificate is a public posting that any bather can read off the wall. They are credited to whoever photographed them and are not offered for reuse.