The mountains of Indonesia are part of the Pacific Ring of Fire, characterized by volcanic activity and diverse ecosystems. The country is home to several prominent mountain ranges, including the Barisan Mountains on the island of Sumatra and the Jayawijaya Mountains in Papua. Many of these mountains are active volcanoes, such as Mount Merapi and Mount Sinabung, which frequently attract scientists and tourists. The high elevations provide unique habitats for various flora and fauna, making Indonesia's mountainous regions vital for biodiversity and conservation efforts.