Foshan alternately romanized as Fatshan is a prefecture-level city in central Guangdong Province, China. The entire prefecture covers 3,848 km2 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 Economic Zone whose built-up area was home to 65,694,622 inhabitants as of 2020, making it the biggest urban area of the world.