Akan Lake is a large crater lake located in the Akan National Park in Hokkaido, Japan. It is known for its stunning natural beauty, surrounded by lush forests and mountains. The lake is famous for its unique marimo, a type of green algae that forms into spherical shapes and floats in the water. The lake is also a popular destination for outdoor activities such as hiking, fishing, and boating. Visitors can enjoy scenic views from various lookout points and explore the surrounding area, which is rich in wildlife and offers opportunities for birdwatching and nature photography.