Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Zentsuji Onsen lies in the town that is the birthplace of Kobo Daishi, the ninth-century Buddhist monk who founded the Shingon sect and established the 88-temple pilgrimage that bears his name across Shikoku. The sodium-bicarbonate waters are gentle and smoothing, traditionally enjoyed by pilgrims who complete a stage of the ancient Shikoku circuit before resting their weary bodies in the soothing mineral baths within a long thermal tradition. Bathing here carries a spiritual dimension unique among Japan's onsen, as the waters of Zentsuji are imbued with centuries of devotional energy from generations of henro pilgrims.
Insider tip — Zentsuji is the birthplace of Kobo Daishi, founder of Shingon Buddhism and the Shikoku 88-temple pilgrimage, and the town's bicarbonate onsen has long been a restorative stop for white-robed henro pilgrims completing the nearby Temple 75. The alkaline water's smoothing effect on the skin aligns with the local philosophy of spiritual and physical purification. The bathhouse district is quiet and modest, contrasting with the elaborate temple complex a short walk away. Arriving as dawn breaks over the ancient cedar-lined approach creates an unforgettable atmosphere.
