Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Sarugakyo Onsen lies in the Minakami area of Gunma Prefecture, a highland valley renowned throughout Japan for the density and quality of its thermal springs, which draw from volcanic heat deep beneath the Tanigawa mountain range that forms the border with Niigata. The sulphurous mineral waters at Sarugakyo carry distinctive compounds and are traditionally associated with well-being and the softness they leave on the skin, reflecting the broader heritage of Minakami's celebrated onsen culture and its designation as one of Japan's finest hot spring regions. Surrounded by beech and cedar forests and positioned near some of Japan's finest white-water rivers, Sarugakyo Onsen balances active outdoor pursuits with the timeless Japanese art of restorative hot spring soaking.
Insider tip — Sarugakyo Onsen sits deep in the Minakami gorge where the Tone River cuts through volcanic tuff, and sulfurous water at 40°C has been used by travelers crossing the old Mikuni pass since the Edo period. The outdoor baths jut over the riverbank, and in winter the steam rising from the pools merges with mist from the river to create an almost theatrical atmosphere. Spring brings cherry blossoms to the gorge walls; autumn turns them to amber and crimson.