Ganiyu

A completely open mixed rotenburo (露天風呂) right on the banks of the Seri River in Nagayu Onsen, free to anyone who dares. You change under a bridge, then lower yourself into a stone-lined bath that sits in full view of the street, part of the charm and part of the dare. The water is a lukewarm bicarbonate spring, best enjoyed on a warm evening when you have the riverside to yourself.