Teshikaga-cho, Kawakami-gun, Hokkaido
Rating
Cost per person
¥500
Mount Io, also known as Atosanupuri or "Naked Mountain" in Ainu, is a striking volcanic landscape near Kawayu Onsen. Witness the powerful steam vents and the unique sulfurous aroma as you approach the mountain's base. Explore the area around the vents to see yellow sulfur crystals and feel the earth's raw energy. Historically, this mountain was a key sulfur mining site that spurred railway construction and the development of Kawayu Onsen. A visit here offers a chance to connect with the area's rich history and natural wonders. Be aware that the fumes can be intense, and caution is advised when approaching the vents.
[Size] Elevation: 512m