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Krakatoa ("Gunung Krakatau) is a volcanic island between Java and Sumatra in Indonesia.

Krakatoa was a volcanic island between Java and Sumatra. The eruption of mount Krakatoa in 1883 was one of the most violent volcanic event on record. A huge explosion (150 megatons of TNT) occured as seawater hit hot magma and turned instantly to steam. The blast was heard over 4000 km (2500 miles) away in Australia and India. The Volcano Explosivity Index (VEI) of the eruption is 6 (colossal).

The whole volcano was destroyed because of the massive explosion. Parts of the volcano fell into the sea and caused giant tsunami (40 meters). The dust from the eruption reached the stratosphere and affected weather worldwide for several years. More than 35 thousands people are killed by tsunami and eruption.

Only about a third of the pre-1883 island survived the blast.

From 1927 to 1930, there were several underwater eruptions on the site of the old Krakatoa volcano. On August 11, 1930, a new volcano and island appeared. This new volcano and island are called "Anak Krakatau" ( Child of Krakatoa).

The island of Anak Krakatoa is a national park. To land on the island, tourist must obtain a permit from Balai Konservasi Sumber Daya Alam (BKSDA).

You can reach Anak Krakatoa island using boats from Anyer beach or Carita beach (Banten), or Lampung. Bring your own live vest. The trip takes up to 2 hours. Beware of strong current and large waves during August, September, Oktober, Nopember. Anak Krakatao is an active volcano.