Kamuiwakka Hot Falls is a unique outdoor onsen experience located in Hokkaido, Japan. The hot spring water flows from an active volcano, Mt. Io, and mixes with a freshwater river to create a relaxing and rejuvenating bathing spot. Visitors can enjoy a soak in the warm pool at the base of the waterfall, surrounded by lush green forest. Just be prepared for a short clamber up the river to reach this hidden gem!