Aokiko Lake is the largest and northernmost lake amongst Nishina Three Lakes. Located in Nagano Prefecture, Aokiko Lake's water is said to be so clear that the mountains of Hakuba reflect off like a mirror image. This area also boasts beautiful natural scenery as the greenery consistently changes throughout the year. Additionally, the roads around the lake are popular for cyclists due to the views and conditions found here. A popular summer activity is firefly watching. This location is perfect for families looking for a peaceful getaway.