
Mount Agung is an active volcano in Bali, Indonesia, southeast of Mount Batur volcano, also in Bali. It is the highest point on Bali, and dominates the surrounding area, influencing the climate, especially rainfall patterns. From a distance, the mountain appears to be perfectly conical.
Mount Agung is a stratovolcano built by a long history of recurrent eruptions. The stratovolcano has been built up from eruptions that produced andesite lava, volcanic breccia, volcanic ash, and pyroclastic debris.
Eruptions at Mount Agung can be deadly and present a variety of volcanic hazards to nearly a million people who live within a 20-mile (30-kilometer) radius of the mountain. The 1963-1964 eruption at Mount Agung was one of the largest volcanic eruptions of the 20th Century, rating VEI 5 on the Volcanic Explosivity Index.