Mount Usu (有珠山, Usuzan) is a volcano which has erupted four times in the past 100 years. Its most recent eruption occurred in the year 2000.
The Usuzan Ropeway brings you close to the volcano's summit. The upper station's observation deck offers panoramic views of Lake Toya and neighboring Showa Shinzan. From a second observation deck a short walk away, there are views of the ocean and Mount Usu's largest crater, which was formed in an eruption in 1977.
The ropeway departs from "Kazan-Mura", a small town of souvenir shops at the foot of Showa Shinzan. From Toyako Onsen, it can be reached in 10 minutes by car or taxi (about 2000 yen one way) or in 15 minutes by bus from Toyako Onsen (350 yen one way, one bus every two hours); however the bus does not run during most of November and from March to late April.