List of islands of Indonesia
The islands of Indonesia, also known as the Indonesian archipelago and formerly known as the Indian archipelago, may refer either to the islands comprising the nation-state of Indonesia or to the geographical groups which include its islands. According to the Indonesian Coordinating Ministry for Maritime Affairs, of 17,508 officially listed islands within the territory of the Republic of Indonesia, 16,056 island names have been verified by the United Nations Group of Experts on Geographical Names (UNGEGN) as of July 2017.
Krakatoa
Indonesia has over 130 active volcanoes, the most of any nation. They make up the axis of the Indonesian island arc system produced by northeastward subduction of the Indo-Australian Plate. A majority of these volcanoes lie along Indonesia's two largest islands, Java and Sumatra. These two islands are separated by the Sunda Strait located at a bend in the axis of the island arc. Krakatau is directly above the subduction zone of the Eurasian Plate and the Indo-Australian Plate where the plate boundaries make a sharp change of direction, possibly resulting in an unusually weak crust in the region.