Observation Open-Air Bath Hanarenoyu / Mantenboshi no Yu
A colorless, transparent, odorless alkaline simple spring with a pH of 9.7, offering a panoramic view of Mount Fuji and Lake Yamanaka at the same time. Known as a skin-beautifying bath that leaves the skin smooth and silky, it has mild stimulation, so both children and older guests can enjoy a long, relaxing soak. At the open-air bath Hanarenoyu and the rock bath in the large bath Mantenboshi no Yu, where you can gaze at a sky full of stars, you can savor a superb view that changes beautifully with each season.
