🏔️ Overview The Barisan Mountains, commonly known in Indonesia as Bukit Barisan, form the mountainous backbone of Sumatra. Extending for nearly 1,700 kilometers (1,050 miles) along the island’s western side, the range contains active volcanoes, immense calderas, forested ridges, crater lakes, deep valleys, and some of the richest tropical ecosystems in Southeast Asia. The range …
