Geology of Indonesia active volcanoes formed Sumatra, Java, Bali, and Nusa Tenggara islands, most of which, particularly Java and Bali, emerged within the last 2–3 million years. The Pacific and Australian plate movements controlled the tectonics of the eastern portion of Indonesia. The tectonics processes in Indonesia formed major structures in Indonesia. The most prominent fault in the west of Indonesia is the Semangko Fault or the Great Sumatran Fault, a dextral strike-slip fault along Sumatra Island (about 1900 km). The formation of this fault zone is related to the subduction zone in the west of Sumatra. Palu-Koro fault is another major structural
History of Indonesia was probably the predecessor of the Tarumanagara kingdom, one of the earliest Hindu kingdoms in Indonesia, producing numerous inscriptions and marking the beginning of the historical period in Java. Indonesia like much of Southeast Asia was influenced by Indian culture. From the 2nd century, through the Indian dynasties like the Pallava, Gupta, Pala and Chola in the succeeding centuries up to the 12th century, Indian culture spread across all of Southeast Asia. References to the Dvipantara or Yawadvipa, a Hindu kingdom in Java and Sumatra appear in Sanskrit writings from 200 BCE. In India's earliest epic, the Ramayana, Sugriva, the