The area of the whole city amounts to more than 13,840 hectares, including 1,075 hectares off the coast, at Zeebrugge (from Brugge aan zee meaning "Bruges on Sea"). The historic city centre is a prominent World Heritage Site of UNESCO. It is oval and about 430 hectares in size. The city's total population is 117,073 (1 January 2008), of whom around 20,000 live in the city centre. The metropolitan area, including the outer commuter zone, covers an area of 616 km (238 sq mi) and has a total of 255,844 inhabitants as of 1 January 2008.