https://www.japan-guide.com/e/e6725.html

Lake Toya (洞爺湖, Tōyako) is part of the Shikotsu-Toya National Park. In addition to the lake itself, the Toyako region features hot springs and an active volcano, Mount Usu, which last erupted in the year 2000. The area also offers many fishing, hiking, and camping opportunities.