Lake Toya is a volcanic caldera lake located in Hokkaido, Japan. It is known for its stunning scenery, surrounded by mountains and lush greenery. The lake has a surface area of about 23 square kilometers and is famous for its clear blue waters, which are fed by hot springs. The area around Lake Toya is part of Shikotsu-Toya National Park, making it a popular destination for outdoor activities such as hiking and boating. Visitors can also enjoy the nearby Toya Onsen, a hot spring resort that offers relaxation and beautiful views of the lake.