The open-air hot spring, which looks like it has blended into a mountain stream, is a super acidic sulfur spring.

The popular "Zao Onsen Large Open-air Bath" is located about 5 minutes by car from Zao Ropeway Sanroku Station. The charm of this place is its dynamic location, which seems to be integrated with the mountain stream. The strong scent of sulfur also stirs up the desire to travel. While the surrounding trees turn orange, why not enjoy a relaxing bath with the sound of the river and the chirping of birds as background music? The bluish, cloudy hot water is 100% fed directly from the source, and is highly acidic with a pH of 1.9. For this reason, the changing room building is built with great craftsmanship and does not use any nails or other hardware. Of course, precious metals such as silver will quickly turn black, so we recommend that you remove any accessories when taking a bath. Please fully enjoy the famous hot springs, which are also known as ''hot springs for beautiful skin.''

An autumn trip where you can fully enjoy the scenery that you cannot experience in everyday life will be etched in your memory.