Java (Indonesian: is an island of Indonesia, bordered by the Indian Ocean on the south and the Java Sea on the north. With a population of over 141 million (Java only) or 145 million (including the inhabitants of its surrounding islands), Java is the home to 56.7 percent of the Indonesian population and is the world's most populous island. The Indonesian capital city, Jakarta, is located on its northwestern coast. Much of Indonesian history took place on Java. It was the center of powerful Hindu-Buddhist empires, the Islamic sultanates, and the core of the colonial Dutch East Indies. Java was also the center of the Indonesian struggle for independence during the 1930s and 1940s. Java dominates Indonesia politically, economically and culturally. Four of Indonesia's eight UNESCO world heritage sites are located in Java: Ujung Kulon National Park, Borobudur Temple, Prambanan Temple, and Sangiran Early Man Site.Formed mostly as the result of volcanic eruptions from geologic subduction between Sunda Plate and Australian Plate, Java is the 13th largest island in the world and the fifth largest in Indonesia by landmass at about 138,800 square kilometres (53,600 sq mi). A chain of volcanic mountains forms an east-west spine along the island. Three main languages are spoken on the island: Javanese, Sundanese, and Madurese, where Javanese is the most spoken; it is the native language of about 60 million Javanese people in Indonesia, most of whom live on Java. Furthermore, most residents are bilingual, speaking Indonesian (the official language of Indonesia) as their first or second language. Java is divided into four administrative provinces, West Java, Central Java, East Java, and Banten, and two special regions, Jakarta and Yogyakarta.The natural environment of Java is tropical rainforest, with ecosystems ranging from coastal mangrove forests on the north coast, rocky coastal cliffs on the southern coast, and low-lying tropical forests to high altitude rainforests on the slopes of mountainous volcanic regions in the interior.However, the first major principality was the Medang Kingdom that was founded in central Java at the beginning of the 8th century. Medang's religion centred on the Hindu god Shiva, and the kingdom produced some of Java's earliest Hindu temples on the Dieng Plateau. Around the 8th century the Sailendra dynasty rose in Kedu Plain and become the patron of Mahayana Buddhism. This ancient kingdom built monuments such as the 9th century Borobudur and Prambanan in central Java.Around the 10th century the centre of power shifted from central to eastern Java. The eastern Javanese kingdoms of Kediri, Singhasari and Majapahit were mainly dependent on rice agriculture, yet also pursued trade within the Indonesian archipelago, and with China and India.Islam became the dominant religion in Java at the end of the 16th century.Java's contact with the European colonial powers began in 1522 with a treaty between the Sunda kingdom and the Portuguese in Malacca. In 1811, Java was captured by the British, becoming a possession of the British Empire, and Sir Stamford Raffles was appointed as the island's Governor. In 1814, Java was returned to the Dutch under the terms of the Treaty of Paris.Indonesian nationalism first took hold in Java in the early 20th century, and the struggle to secure the country's independence following World War II was centered in Java. In 1949, Indonesia became independent and the island has dominated Indonesian social, political and economic life, which has been the source of resentment of those residents in other islands.