-2011- Gensenfuro 28 Jun 2026

For a bath to be legally classified as an onsen in Japan, the water must be at least 25°C at the source. However, for a Gensenfuro —where no heating is allowed—the temperature is critical. If a source is too cool, it cannot be a Gensenfuro. If it is too hot, it must be cooled naturally.

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Some of the older wooden structures featured have since been renovated or lost to natural elements, making this a historical record. For a bath to be legally classified as

The term (源泉風呂) translates literally to "source spring bath." In the context of Japanese travel media and home video releases, this series has served as a digital archive of the country’s most pristine thermal waters. If it is too hot, it must be cooled naturally

If you still operate a from 2011: