Yumo.to

A Japan-wide onsen map with tattoo and water filters

Visit yumo.to ↗Alternativestop 14% of March 2026

What it does

Yumo.to is a searchable map of 19,652 onsens across all 47 prefectures in Japan. I built it by merging national datasets, prefecture and municipal open data, OSM, and water-chemistry sources into one place. You can filter by tattoo policy, price, opening hours, access, and water data, and each listing links back to its sources.

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