The built-up area of the Pearl River Delta Economic Zone covers around 17573 sqkm and has been estimated to house 22 million people, including Guangzhou's nine urban districts, Shenzhen (5.36m), Dongguan (3.22m), Zhongshan (3.12m), most of Foshan (2.2m), Jiangmen (1.82m), Zhuhai (890k), and Huizhou's Huiyang District (760k).