The Aso Caldera is one of the largest volcanic calderas in the world, located in Kumamoto Prefecture, Japan. It was formed by multiple volcanic eruptions over the past 300,000 years, creating a vast depression that measures about 25 kilometers in diameter. The caldera is home to several active volcanoes, including Mount Aso, which is known for its frequent eruptions and a large, active crater. Inside the caldera, visitors can find lush farmland, hot springs, and scenic landscapes. The area is also rich in biodiversity, supporting various plant and animal species. The Aso region is a popular destination for tourists seeking outdoor activities, such as hiking and exploring the unique geological features.