Incheon International Airport (IATA: ICN, ICAO: RKSI) is the main international airport serving South Korea, located in Incheon. It is also one of the largest and busiest airports in the world. This airport opened for business on 29 March 2001, to replace the older Gimpo International Airport, which now serves mostly domestic destinations and shuttle flights to several East Asian metropolitan areas, including Beijing–Capital, Kaohsiung, Nagoya–Centrair, Osaka–Kansai, Shanghai–Hongqiao, Taipei–Songshan and Tokyo–Haneda. Incheon International Airport is located west of Incheon's city center, on an artificially created piece of land between Yeongjong and Yongyu Islands. A shallow sea originally separated the two islands. That area between the two islands was reclaimed for the construction project, effectively connecting the once-separate Yeongjong and Yongyu islands. The reclaimed area and the two islands are all part of Jung-gu, an administrative district of Incheon.