Incheon emerged as an administrative district known as ‘Marsoholhyeon’ during the reign of King Jangsu of Goguryeo (475 AD). After Silla united the three kingdoms, the district was renamed as ‘Soseonghyeon’ using Chinese characters during the reign of King Gyeongdeok of Silla. Located just west of Seoul on the Yellow Sea, also referred to as the East China Sea, Incheon is Korea’s 4th largest city. Over the past decade Incheon has experienced unprecedented growth. Incheon is now home to the world’s largest international airport and free economic zone and is poised to continue its ever expanding infrastructure.