Port of Tanjung Perak is the second busiest sea port in Indonesia, located at Surabaya, East Java. It is the main port for the eastern part of the island of Java. The port is accessed from the North through the Madura Strait, a 25-mile long, 100-meter wide, and 9.5-meter deep channel between East Java and Madura Island. Because of its strategic position and the existence of surrounding advantageous hinterlands, the port constitutes the center of inter island shipping for Eastern Indonesia.