The Busan Metro () is a subway system in Busan, South Korea. Busan is one of four cities in South Korea with a subway system; the others are Seoul, Daegu and Incheon. Subway systems are also being built in Gwangju and Daejeon. Planning for the Busan Subway began in 1979 and building started in 1981. The first stage, a line with 17 stations between Nopo-dong and Beomnaegol opened on the 19 July 1985. There are now 102 stations, four lines, and of tracks.