Surabaya (Indonesian pronunciation: [surəˈbaja]) (formerly Dutch: Soerabaja/Soerabaia Javanese: Suroboyo) is the capital of Jawa Timur (East Java) and the second-largest-city in Indonesia with a population over 2.9 million, located on northeastern Java island and along the edge of the Madura Strait.The city is known as Kota Pahlawan 'city of heroes' due to the importance of the Battle of Surabaya in galvanizing Indonesian and international support for Indonesian independence during the Indonesian National Revolution. Surabaya was once the largest city in Dutch East Indies and virtually the center of trading in the nation, exceeding those of Batavia, competing with the likes of Singapore and Hong Kong.