Kaohsiung officially Kaohsiung City, is one of the five special municipalities under the administration of the Republic of China. Located in southern-western Taiwan and facing the Taiwan Strait, Kaohsiung is the largest municipality in Taiwan at 2,947.62 km2 (1,138.08 sq mi), and second most populous with a population of approximately 2.77 million. Since its start at 17th century, Kaohsiung has grown from a small trading village, into the political, economic, transportation, manufacturing, refining, shipbuilding, and industries centers of southern Taiwan. It is a global city with sufficiency which categorized by GaWC in 2010. The Kaohsiung International Airport serving the city is the second largest airport in Taiwan. The Port of Kaohsiung is the largest harbor in the Taiwan, but not officially part of Kaohsiung City. The southern terminal of the Sun Yat-sen Freeway is in Kaohsiung.