It is one of the earliest port cities in Southeast Asia. Located on northeastern Java on the Madura Strait, it is the second-largest-city in Indonesia. As of the 2010 census, the city had a population over 2.8 million, approximately 6 million in the metropolitan area, and an 'extended metropolitan area' (Gerbangkertosusila) with more than 9 million inhabitants. During 18th and 19th centuries, Surabaya was the largest city in Dutch East Indies and the center of trading in the nation, larger than Batavia (at present Jakarta), 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.