Gozaishi Kosen

Gozaishi Kosen carries the designation kosen — cold spring — indicating that its naturally occurring bicarbonate mineral water surfaces at a temperature below the 25°C threshold required under Japanese law to be classified as a hot spring, yet its mineral content is no less notable for this geological distinction, as bicarbonate-rich mineral waters of any temperature are prized for their naturally alkaline, skin-conditioning character. The difference between onsen and kosen in Japan reflects only the temperature at emergence, not the mineral content, and bicarbonate cold springs have long been appreciated within a thermal tradition that parallels the appeal of their warmer counterparts in Japanese wellness culture. Gozaishi Kosen represents the broader spectrum of Japan's natural spring culture, where the earth's mineral gifts are appreciated across the full range of temperatures at which geothermal and mineral water surfaces, and the designation of cold spring is understood as a description rather than a limitation.