Lake Towada on Honshu Island, Japan40.4N 140.8E
Lake Towada (top center) is the largest caldera lake on Honshū island, Japan. It occupies the caldera of an active volcano. Located on the border between Aomori and Akita prefectures, it lies 400 meters (1,800 ft) above sea level and is 327.0m (1,073 ft) depth, and is drained by the Oirase River.
With a surface area of 61.1 km², Towada is Japan’s 12th largest lake, its bright blue color is due to its great depth. The lake is roughly circular, with two peninsulas extending from its southern shore approximately one-third into the center of the lake.