Lake Onuma is a scenic lake located in Onuma Quasi-National Park in Hokkaido, Japan. It is known for its beautiful landscapes, featuring numerous small islands and a backdrop of volcanic mountains. The lake covers an area of approximately 13 square kilometers and is a popular destination for outdoor activities such as hiking, boating, and birdwatching. The lake is also home to diverse wildlife, including various species of birds and fish. Visitors can enjoy walking along the well-maintained trails that offer stunning views of the surrounding nature. Onuma Park is particularly famous for its seasonal changes, showcasing vibrant colors in spring and autumn.