Natural park located west of Kusatsu Onsen, famous for its natural hot spring sources that flow between rocks, forming steaming streams and pools. The atmosphere is especially striking in cold or misty weather. The park also features a large outdoor bath, the Sainokawara Rotenburo, known for its impressive size and scenic natural setting. It's an ideal spot for a relaxing stroll or soak at the end of the day.

Price: Free access to the park. Outdoor bath costs around 700 ¥
Touristy? : Very touristy, especially in the late afternoon and during the foliage seasons (spring/autumn).