Daejeon Subway Line 1 is a subway line is located in Daejeon, South Korea. After excluding the Seoul metropolitan area, it was the fourth subway line created in Korea, following Busan, Daegu, and Gwangju. Its line color is ● green. It is 22.6 km (14.0 mi) long with 22 stations. It is the first of five planned lines for the Daejeon Metro.