Aso is a volcanic mountain located in Kumamoto Prefecture, Japan. It is one of the largest active volcanoes in the world, featuring a massive caldera that spans approximately 25 kilometers in diameter. The caldera contains several towns and is surrounded by lush landscapes, making it a popular destination for tourists and nature enthusiasts. The central part of Aso includes multiple peaks, with Mount Nakadake being the most active. Visitors can observe volcanic activity, such as steam vents and sulfur deposits, while enjoying scenic views. The area is also known for its hot springs and rich agricultural land, particularly for growing rice and vegetables.