Seoul Metropolitan Subway ( Click the map to enlarge it! )
The Seoul Metropolitan Subway or Metropolitan Subway in Seoul, in Seoul, South Korea, is one of the most heavily used rapid transit systems in the world, with well over 8 million trips daily on the system's thirteen lines (total figures for Seoul Metro, Seoul Metropolitan Rapid Transit Corporation & Korail commuter lines). The system serves Seoul, Incheon, Gyeonggi-do, northern Chungcheongnam-do, and western Gangwon-do. There is a connection to the Incheon International Airport Railroad (A'REX) at Gimpo Airport Station on Line 5 and a free transfer with the single-line Incheon Subway system at Bupyeong on Seoul Subway Line 1. Over 70% of the total metro track length is underground. By 2008, all stations operated by Seoul Metro and SMRT are all installed with Platform Screen Doors, but only within Seoul, excluding areas operated by Korail.
Its capital is Seoul, which is also its largest city. South Korea lies in a humid continental and humid subtropical climate region with a predominantly mountainous terrain. Its territory covers a total area of 99,392 square kilometers and has a population of 50 million. Seoul, capital of South Korea, reaches a population of 10,421,782.
All directional signs in the Seoul Subway are written in both Korean and English. Station signs and some maps also display Hanja. The pre-recorded voice announcement in the trains indicating the upcoming station, possible line transfer and exiting side are all in Korean followed by English, and in some cases Japanese then Chinese.