Foshan or Fatshan is a prefecture-level city in central Guangdong Province, China. The entire prefecture covers 3,848 km2 (1,486 sq mi) and had a population of 9,498,863 as of the 2020 census. The city is part of the western side of the Pearl River Delta megalopolis, a conurbation housing 86,100,000 inhabitants, making it the biggest urban area of the world.