Indonesia has approximately 127 to 130 active volcanoes, the highest number of active volcanoes globally.
Counting all active, dormant and extinct volcanoes, there are over 500 total volcanic locations spread across the archipelago.
Indonesia’s active Anak Krakatau volcano erupted early Sunday, Sept. 6, 2026, causing major flight disruptions.
The volcanic island showed signs of activity since Friday before erupting for 30 seconds at 3:53 a.m.
No casualties were reported and no evacuation orders were issued as the nearest settlement is more than 10 miles away.
Authorities warned residents and visitors to stay at least 3 kilometers, or nearly 2 miles, clear of the active crater.
Volcanic ash drifted across parts of the capital city of Jakarta and Lampung province on the southern tip of Sumatra island.
Aviation officials closed airspace around Soekarno-Hatta and Halim Perdanakusuma airports in Jakarta, as well as four other regional airports.
By mid-afternoon, the closures had affected hundreds of flight movements and about 22,800 passengers on Sunday.
The airport released a travel advisory early Sunday regarding the temporary operational changes.
“Due to increased activity from the Mount Anak Krakatau eruption, Soekarno-Hatta International Airport has temporarily suspended flight operations from 5:30 a.m. to 9.30 a.m.,” reported AP News.
Ministry of Transportation Director General of Civil Aviation Lukman F. Laisa outlined the core objective of the transport authorities.
“Safety remains our top priority in every operational decision,” CBS News reported.
Laisa warned that flight schedules could face cascading disruptions affecting aircraft rotations, fleet availability and terminal capacity as airlines work to restore operations.
To manage terminal volumes, the outlets, per the local outlets, reported that travelers should check with airlines and temporarily avoid the airport.
Anak Krakatau is the offspring of the famous volcano whose monumental 1883 eruption triggered a period of global cooling.
In 2018, its eruption triggered an underwater landslide and a deadly tsunami that killed at least 430 people in Sumatra and Java.