Mount Aso is the largest active volcano in Japan, and is among the largest in the world. It stands in Aso Kuj? National Park in Kumamoto Prefecture, on the island of Ky?sh?. Its peak is 1592 m above sea level. Aso has one of the largest calderas in the world (25 km north-south and 18 km east-west). The caldera has a circumference of around 120 km (75 mi), although sources vary on the exact distance.
• Aso became a member of the Japanese Geoparks Network(JGN) in October 2009