Shironoyu is a natural hot spring center located near Kumamoto Castle. The center features both outdoor Western-style baths with underwater jets and Japanese-style stone baths, as well as saunas and other spa facilities. The spring water used is mildly alkaline and can help relieve nerve pain and muscle fatigue. Visitors can also get full-body scrubs, massages, and beauty treatments on-site, and there is also a restaurant and shop that feature local Kumamoto products. *No bathing suits are allowed when entering baths except for private family bath areas.