The heart shaped Lake Aoki boasts some of the clearest waters in the prefecture. It is also the largest of the Three Lakes of Nishina. You can enjoy the changing richness for the four seasons, with cherry blossoms in spring, deep green leaves in summer, brightly colored autumn leaves and migratory birds visiting in winter. Around the lakeside you can find an old road, a campground and a ski resort. You may wish to view the mountains of Hakuba, reflected in the waters of the lake, from the southeast shore. The road around the lake is ideal for cycling. Firefly viewing cruises are a popular summer activity.