Tamatsukuri Onsen

Tamatsukuri Onsen sits along the Tamayu River in Matsue City, Shimane Prefecture, within the San'in region of western Honshu. The spring is documented in the Izumo no Kuni Fudoki (733 CE), one of the oldest provincial gazetteers in Japan, which records: 'Once bathing makes skin appear youthful, twice bathing cures any ailment — no one has heard of its effects failing, so people call it the divine spring.' This description, over 1,290 years old, established Tamatsukuri as Japan's foremost beauty onsen, a reputation it has maintained continuously. The water is a sodium-calcium sulfate-chloride type, weakly alkaline, and notably rich in metasilicic acid at concentrations exceeding 100 mg/L — a threshold that qualifies it as a certified beauty spring under Japanese onsen classification. Metasilicic acid is a collagen-stimulating mineral used in cosmetic formulations; its natural presence at these levels gives the water an unusually smooth, lotion-like quality on the skin. Tamatsukuri was also referenced by the court lady Sei Shonagon in the Pillow Book, cementing its place in the classical literary canon of Japan. The resort town today includes ryokans, day-bathing facilities, agate stone baths (local Tamatsukuri agate has been worked here since antiquity), and a riverside promenade with power spot shrines.