Java ( ) is an island of Indonesia and the site of its capital city, Jakarta. Once the centre of powerful Hindu kingdoms, Islamic sultanates, and the core of the colonial Dutch East Indies, Java now plays a dominant role in the economic and political life of Indonesia. Home to a population of 130 million in 2006, it is the most populous island in the world, ahead of Honshū, the main island of Japan. Java is also one of the most densely populated regions on Earth. If the island were a country, it would be the tenth most populous in the world, just ahead of Japan.

Formed mostly as the result of volcanic events, Java is the 13th largest island in the world and the fifth largest island in Indonesia. A chain of volcanic mountains forms an east-west spine along the island. It has three main languages, though Javanese is dominant and is the native language of 60 million people in Indonesia, most of whom live on Java. Most residents are bilingual, with Indonesian as their second language. While the majority of Javanese are Muslim, Java has a diverse mixture of religious beliefs and cultures.

Etymology

The origins of the name 'Java' are not clear. One possibility is that early travellers from India named the island after the jáwa-wut plant, which was said to be common in the island during the time, and that prior to Indianization the island had different names. There are other possible sources: the word jaú and its variations mean "beyond" or "distant". And, in Sanskrit yava means barley, a plant for which the island was famous. Other source states that the "Java" word is derived from a Proto-Austronesian root word, meaning 'home'.

Outsiders often referred to Java and the neighboring islands by the same name, or used names inconsistently for different islands. For example, Marco Polo refers to neighbouring Sumatra as "little Java".

Geography

Java is almost entirely of volcanic origin; it contains no fewer than thirty-eight mountains forming an east-west spine which have at one time or another been active volcanoes. The highest volcano in Java is Mount Semeru (3,676 m). The most active volcano in Java and also in Indonesia is Mount Merapi (2,968 m). See Volcanoes of Java. Further mountains and highlands help to split the interior into a series of relatively isolated regions suitable for wet-rice cultivation; the rice lands of Java are among the richest in the world. Java was the first place where Indonesian coffee was grown, starting in 1699. Today, Coffea arabica is grown on the Ijen Plateau by small-holders and larger plantations.

The area of Java is approximately 139,000km². The island's longest river is the 600 km long Bengawan Solo River. The river rises from its source in central Java at the Lawu volcano, then flows north and eastwards to its mouth in the Java Sea near the city of Surabaya. The island is administratively divided into four provinces (Banten, West Java, Central Java, and East Java), one special region (Yogyakarta), and one special capital district (Jakarta).