Songdo International Business District (SIBD) is a new smart city or "ubiquitous city" built from scratch on 600 hectares (1,500 acres) of reclaimed land along Incheon's waterfront, 65 kilometres (40 mi) southwest of Seoul, South Korea and connected to Incheon International Airport by a 12.3-kilometre (7.6 mi) reinforced concrete highway bridge, called Incheon Bridge.