Seodaemun District (Korean: 서대문구, romanized: Seodaemun-gu, "Great West Gate") is one of the 25 districts of Seoul, South Korea.Seodaemun has a population of 313,814 (2010) and has a geographic area of 17.61 km2 (6.8 sq mi), and is divided into 14 dong (administrative neighborhoods). Seodaemun is located in northwestern Seoul, bordering the city districts of Eunpyeong to the northwest, Mapo to the southwest, Jung to the southeast, and Jongno to the east.