Izu-Yugawara Onsen is a hot spring town in Shizuoka, Japan. Officially the water is classed as simple spring. 7 inns take visitors here.
Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.
Figures from the town's Japanese Wikipedia article.
35.1400, 139.0700 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.