Java is the heartland ofIndonesiawith more than 130 million people inhabiting an area as big as Greece.Formed mostly as the result of volcanic eruptions,Javais the13th largest islandin the world and thefifth largestinIndonesia. A chain of volcanic mountains forms an east–west spine along the island.Java is divided into four provinces,West Java,Central Java,East Java, andBanten, and two special regions,JakartaandYogyakarta.