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Location Indonesia is located between the Australian and Asian continental mainland and divides the Pacific and Indian Oceans at the Equator. It is an archipelago composed of some 13,670 islands, of which more than 7,000 are uninhabited. There are five main islands in Indonesia. These are: Java, Sumatra, Kalimantan, Sulawesi and Irian Jaya. Almost 95 percent of the people live on those main islands, and more than 62 percent make their homes in Java. Geographical Features Most of the islands of Indonesia are mountainous. The lowlands, with a few exceptions, are relatively small. Most of Indonesia's mountains are the products of mountain-building forces associated with the intersection of two blocks, or plates, of the Earth's crust—the Pacific Plate and the Indian Ocean Plate, which meet in Indonesia. These plates have long been moving slowly into the Eurasian Plate. The resulting pressure pushed up mountain ranges and created the numerous volcanoes of Indonesia, the contorted shapes of islands like Celebes, and the ocean deeps, such as the Java Trench. This trench, located south of Java, is about 24,000 feet deep. Indonesia has more than 60 active volcanoes. They are in a zone that runs mainly through