Onuma Lake is a scenic body of water located in Onuma Quasi-National Park in Hokkaido, Japan. The lake is known for its beautiful landscapes, featuring numerous small islands and lush greenery. It covers an area of approximately 13 square kilometers and is surrounded by volcanic mountains, making it a popular destination for nature lovers and outdoor activities. The lake is also home to diverse wildlife, including various bird species and fish. Visitors can enjoy activities such as hiking, boating, and cycling along the well-maintained paths. Onuma Lake is particularly stunning during the autumn months when the foliage changes color, attracting many tourists.