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Tokachigawa Onsen

Moor (plant-derived) hot springs take millions of years to be created.

Tokachigawa hot spring (Otofuke town) is slightly unique as it is not a hot spring which has been created exactly by volcanic activity.
Millions of years ago, the Tokachi Plains was once sea, and it is said that deposits of peat built up on an area of marshland and this peat turned into lignite.
The moor hot spring gushes forth through this vegetative organic matter.