Tanzhou is a town situated at the southern extremity of the prefecture-level city of Zhongshan, Guangdong province. The population of Tanzhou is of 219,943 residents[when?]. The total area of the town is 136 square kilometres (53 sq mi). Tanzhou is within 10 km (6.2 mi) northwest of the border with Macau and borders Zhuhai to the south and east; it is thus much closer to central Zhuhai than central Zhongshan.