Observed arrival · 2026-09-10
Onsen Paradise Reads the Bathwater
A searchable Japanese hot-spring guide that evaluates baths by the qualities of their water, alongside a magazine about geology, history, chemistry, and bathing customs.
Field notes
The site organizes hot springs around water conditions rather than lodging or destination marketing. Its stated records compare source temperature, spring output, the distance to the bath, and treatment steps such as dilution, heating, circulation, and disinfection. The accompanying magazine currently lists 18 explanatory pieces, including discussions of underground water age, carbonated springs, sulfur odor, temperature, mineral deposits, and the interpretation of legally required analysis sheets.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue