Tokachigawa Onsen Hokkaido

Tokachigawa Onsen is located in the town of Otofuke in the Tokachi Plain of Hokkaido, where unique bicarbonate thermal waters known as 'mohr-type' spring waters—containing a high concentration of dissolved humic plant acids derived from ancient peat deposits beneath the agricultural plain—give these onsen their distinctive dark amber colour and exceptional therapeutic reputation among Japan's most unusual hot spring types. The brown bicarbonate-humic acid mineral character of Tokachigawa's waters is considered among the most unusual in Japan, with properties associated with moisturizing and anti-aging effects on the skin, anti-inflammatory action, and the particularly warming metabolic effects of these plant-organic mineral compounds unique to peat-based geothermal systems. The Tokachi Plain—Japan's most productive dairy farming region, famous for its wide horizons, horse-racing culture, and the distinctive terroir that produces some of Hokkaido's finest agricultural products—frames Tokachigawa Onsen within a pastoral landscape where uniquely coloured plant-infused thermal waters emerge as a geological curiosity unlike any other hot spring type in Japan.