Gero Onsen (One of Japan’s Three Famous Hot Springs & Silky Skin Waters)

Category: Historic Onsen Town & Japan’s Three Famous Hot Springs | Location: Gifu

Sprawling serenading along the verdant gorge of the Hida River in Gifu Prefecture, Gero Onsen boasts a storied thermal bathing heritage that has refreshed travelers for over a millennium since the 10th-century Heian period. Alongside Arima Onsen in Hyogo and Kusatsu Onsen in Gunma, Gero was officially canonized as one of "Japan’s Three Famous Springs" (*Nihon Sanmeisen*) by prominent Edo-period Confucian philosopher Hayashi Razan. According to enduring legend, when an ancient earthquake dried up the original volcanic spring atop Mount Yugamine, an injured sacred white egret (*Shirasagi*) landed daily beside the Hida River to reveal the miraculous new thermal source to local villagers before ascending heavenward. The hallmark of Gero’s mineral waters is its exceptional alkaline simplicity, boasting an astonishingly high pH of 9.18 and geothermal springhead temperatures reaching 84°C. Colorless, odorless, and completely transparent, the water feels velvety and naturally viscous like a luxurious cosmetic serum. It gently dissolves dead keratin and sebum, leaving the bather’s skin remarkably silky, moisturized, and rejuvenated, earning Gero its celebrated nationwide reputation as the quintessential "Water of Beauties" (*Bijin-no-Yu*). Strolling through the atmospheric riverside town in lightweight cotton Yukata and wooden Geta sandals is the quintessential Gero ritual. Visitors can relax at *Funsenchi*, a natural stone hot spring pool situated directly on the gravel riverbed, soak tired feet in numerous free streetside *Ashiyu* footbaths, sample warm steamed Gero Onsen pudding and local craft gelato, and explore the Gero Onsen Gassho Village, which preserves ten historic thatched-roof mountain houses and hosts traditional shadow-puppet theater.