The City of Seoul and the Seoul Metropolitan Subway
The City of Seoul, which had a population of 10.04 million as of 2010 in a land area of 606 km2, is surrounded by the Province of Gyeonggi and the City of Incheon, which have populations of 10.87million and 2.71million, respectively, in a land area of 11,164 km2 (see Fig. 1). The City of Seoul, the Province of Gyeonggi, and the City of Incheon together constitute the Seoul Metropolitan Area (SMA).