Surabaya (Indonesian pronunciation: [suraˈbaja]) is the capital of East Java province in Indonesia. Surabaya is the second-largest city in Indonesia with a population of over 3 million within the city proper and over 10 million in the Greater Surabaya metropolitan area, known as Gerbangkertosusila. Located on northeastern Java on the Madura Strait, it is one of the earliest port cities in Southeast Asia. In the 18th and 19th centuries, Surabaya was the largest city in the Dutch East Indies, larger than Batavia (present day Jakarta) and the centre of trading in the nation, which was then a competitor of Shanghai and Hong Kong. Today the city remains one of the important financial hubs of the Indonesian archipelago, arguably second only to Jakarta, and the Port of Tanjung Perak is Indonesia's second-busiest seaport.