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Tokachigawa Onsen

The plant-derived moor hot springs were naturally created over millions of years.

Tokachigawa Hot Spring (Otofuke) is fairly unique, as it was not created entirely by volcanic activity.
Millions of years ago, the Tokachi Plains were covered by ocean, and it is thought that deposits of peat built up on an area of marshland and turned into lignite.
This moor hot spring gushes from this lignite through layers of vegetative organic matter.