Busan Metro is an urban rail system operated by Busan Transportation Corporation of South Korea. Opened on July 19, 1985, the subway system has expanded over the years, becoming an integral part of Busan's extensive public transportation network. The metro has 4 numbered lines, covering 116.5 kilometers (72.4 mi) of route and serving 114 stations. Including the BGL and Donghae Line, the network covers 205.6 kilometers (127.8 mi) of route and serves 158 stations.