history
Before the 1883 eruption, Krakatoa consists of three islands and several islets. The Krakatoa island was 9 kilometers long and 5 kilometers wide.


There were three volcanic cones on Krakatoa: Rakata, Danan, and Perboewatan. Danan may have been a twin volcano. Krakatoa is directly above the subduction zone Eurasian and Indo-Australian Plate, where the plate boundaries undertake a sharp change of direction, possibly resulting in an unusually weak crust in the region.

Religion