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Mount Aso, is the largest active volcano in Japan, and is among the largest in the world.
Its peak is 1592 m above sea level.
Its caldera is 25 km across north to south and 18 km
across east to west.
The caldera has a circumference of around 120 km,
although sources vary on the exact distance.
The central cone group of Aso consists of five mountains:
Mt.Naka, Mt.Neko, Mt.Taka, Mt. Eboshi, and Mt.Kishima.