Java is Indonesia's fifth-largest island. Its 120 million people make up 65% of Indonesia's entire population, and makes Java the most populated island in the world. Covering an area of 127,569 sq. km (7% of Indonesia's area) and with a population density of 940 people/sq. km, Java is the world's most crowded island, as well.Jakarta, the capital of Indonesia, is located on northwest region of Java. Surabaya (the second largest city in Indonesia), is located on East Java. Java acts as Indonesia's center of cultural and economic activity. The main ethnic group in Java is '''Javanese''', except for the West Java region where most people are '''Sundanese'''. In the province of East Java, 22% of the population is of '''Madurese''' descent. Half of them live on the island of Madura. Jakarta is the capital of Indonesia. Population: 8 million (within city limits). The total population of Jakarta and its suburbs: 12 million people. The population of Jakarta is a mix of many ethnic groups. The group native to Jakarta is Betawi. http://wikitravel.org/en/Java