Mount Agung, also known as Gunung Agung, is an active volcano located on the island of Bali in the Indonesia island arc. It is the highest point on the island of Bali at an elevation of 9944 feet (3031 meters). 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 More recently, in 2017-2018, Mount Agung produced large ash clouds that rose to elevations of about 12,000 feet (4000 meters). These caused an aviation emergency and forced closure of the Ngurah Rai International Airport, ruining the plans of thousands of tourists and other travelers. Fears of pyroclastic flows, lahars and ashfalls caused the Indonesian government to order the evacuation of about 100,000 people who live within a 6-mile (10-kilometer) radius of the volcano.”