The Aso Mountains are a volcanic mountain range located in Kumamoto Prefecture, Japan. This region is known for its stunning landscapes, including lush green fields and active volcanoes. The most prominent peak, Mount Aso, features one of the world's largest volcanic calderas, which is about 25 kilometers in diameter. The Aso Mountains are part of the Aso Kuju National Park, attracting hikers and nature enthusiasts. The area is rich in biodiversity, with various plant and animal species. Additionally, the region is famous for its hot springs, providing visitors with opportunities to relax and enjoy the natural beauty surrounding them.