Jakarta, officially the Special Capital Region of Jakarta, is the largest city in the world by population and the de facto capital and largest city of Indonesia and an autonomous region at the provincial level. Lying on the northwest coast of Java, the world's most populous island, Jakarta is the largest metropole in Southeast Asia and serves as the Headquarters of ASEAN. The Special Region has a status equivalent to that of a province and is bordered by the province of West Java to the south and east and Banten to the west. Its coastline faces the Java Sea to the north, and it shares a maritime border with Lampung to the west. Jakarta's metropolitan area has an estimated population of 41.9 million as of 2025, making it the largest urban area in Indonesia and the world; in addition of being ASEAN's second largest economy after Singapore.