Iyotani Onsen Ehime

Iyotani Onsen is located in Ehime Prefecture on Shikoku island, in the mountain interior of western Japan's smallest main island, where chloride-rich thermal waters emerge from volcanic geology in the rugged river valley landscapes that characterize Shikoku's mountainous interior far from the coastal plains and resort towns. The sodium-chloride mineral composition of these onsen waters is valued in the Japanese bathing tradition for its body-warming character, skin conditioning, and the well-being of restful immersion in a landscape shaped by the geological forces that created Shikoku's dramatic topography of steep ridges and deep river gorges. Shikoku's interior—through which the ancient 88-temple pilgrimage route passes in some of its most challenging mountain stages—has long been a landscape of spiritual significance in Japanese Buddhist tradition, and bathing in these mineral waters within this context of pilgrimage and mountain passage gives the onsen a reflective depth that complements its restful character.