The Pearl River is an extensive river system in southern China. "Pearl River" is often also used as a catch-all for the watersheds of the Pearl tributaries within Guangdong, specifically the Xi ('west'), Bei ('north'), and Dong ('east'). These rivers all ultimately flow into the South China Sea through the Pearl River Delta. Measured from the farthest reaches of the Xi River, the 2,400-kilometer-long (1,500 mi) Pearl River system constitutes China's third-longest, after the Yangtze River and the Yellow River, and its second largest by volume, after the Yangtze. The 453,700 km2 (175,200 sq mi) Pearl River Basin drains the majority of Guangdong and Guangxi provinces, as well as parts of Yunnan, Guizhou, Hunan and Jiangxi; it also drains the northernmost parts of Vietnam's Northeast Cao Bằng and Lạng Sơn provinces. The Pearl River is famed as the river that flows through Guangzhou.

Macau or Macao is a special administrative region of the People's Republic of China. With a population of about 680,000 and an area of 32.9 km2 (12.7 sq mi), it is the most densely populated region in the world.