Zhongshan Island, formerly also known as Macau Island or Xiangshan Island, is a river island on the west bank of the Pearl River Delta in Guangdong, China. This area is separated from the rest of the river delta by the Xi River and Shiqi River, and consists of portions of three cities with a combined population of approximately 3.6 million as of 2020: Macau, Zhuhai and Zhongshan.