Pearl River (China) in the context of "South Central China"

Shenzhen is a prefecture-level city in the province of Guangdong, China. A special economic zone, it is located on the east bank of the Pearl River estuary on the central coast of Guangdong, bordering Hong Kong to the south, Dongguan to the north, Huizhou to the northeast, and Macau to the southwest. With a population of 17.5 million in 2020, Shenzhen is the third-most-populous city by urban population in China after Shanghai and Beijing. The Port of Shenzhen is the world's fourth-busiest container port.

Shenzhen roughly follows the administrative boundaries of Bao'an County, which was established in imperial times. As a result of the Opium Wars, the southern portion of Bao'an County was ceded to Britain and became part of British Hong Kong, while the village of Shenzhen was next to the border. Shenzhen turned into a city in 1979. In the early 1980s, economic reforms introduced by Deng Xiaoping resulted in the city becoming the first special economic zone of China due to its close proximity to Hong Kong, attracting foreign direct investment and migrants searching for opportunities. In thirty years, the city's economy and population boomed and has since emerged as a hub for technology, international trade, and finance.

Zhuhai is a resort city located on the west bank of the Pearl River estuary, near Macau on the central coast of southern Guangdong, China, on the southeastern edge of the Pearl River Delta. Its name literally means "pearl sea", which originates from the city's location at the mouth of the Pearl River meeting the South China Sea. Zhuhai borders Jiangmen to the west, Zhongshan to the north and Macau to the southeast, and has a bridge connecting to Hong Kong.

Zhuhai was one of the original four Special Economic Zones established in 1980, as well as one of China's premier tourist destinations, being called the Chinese Riviera. While the city is located in the traditionally Cantonese-speaking province of Guangdong, a significant portion of the population is now made up of Mandarin-speaking economic migrants originally from inland provinces.

The Liao River (simplified Chinese: 辽河; traditional Chinese: 遼河; pinyin: Liáo Hé) is the principal river in southern Northeast China, and one of the seven main river systems in China. Its name is derived from the Liao region, a historical name for southern Manchuria, from which the Liaoning province, Liaodong Peninsula, and Liao dynasty also derive their names. The river is also popularly known as the "mother river" in Northeast China. Coursing 1,345 kilometres (836 mi) long, the Liao River system drains a catchment basin of over 232,000 square kilometres (90,000 sq mi), but its mean discharge is quite small at only about 500 cubic metres per second (18,000 cu ft/s), about one-twentieth that of the Pearl River. The Liao River has an exceedingly high sediment load because many parts of it flow through powdery loess.

The Liao River is also an important geographical landmark, as it divides the modern Liaoning province into two broad regions — Liaodong ("east of Liao") and Liaoxi ("west of Liao"). Historically, this demarcation though was not based on the river itself, but on a large wetland that once existed on the right (west) bank of the lower Liao River known as the Liao Mire (辽泽), which stretched east of the Yiwulü Mountain to the Liao River from Xinmin to Panshan.

The Canton System (1757–1842; Chinese: 一口通商; pinyin: Yīkǒu tōngshāng; Jyutping: jat1 hau2 tung1 soeng1, lit. "Single [port] trading relations") served as a means for Qing China to control trade with the West within its own country by focusing all trade on the southern port of Canton (now Guangzhou). The protectionist policy arose in 1757 as a response to a perceived political and commercial threat from abroad on the part of successive Chinese emperors.

From the late seventeenth century onwards, Chinese merchants, known as Hongs (Chinese: 行; pinyin: háng), managed all trade in the port. Operating from the Thirteen Factories located on the banks of the Pearl River outside Canton, in 1760, by order of the Qing Qianlong Emperor, they became officially sanctioned as a monopoly known as the Cohong. Thereafter Chinese merchants dealing with foreign trade (Chinese: 洋行; pinyin: yángháng; Jyutping: joeng4 hong2; lit. "ocean traders", i.e. "overseas traders" or "foreign traders") acted through the Cohong under the supervision of the Guangdong Customs Supervisor (Chinese: 粵海關部監督; pinyin: Yuèhǎi guānbù jiàn dù; Jyutping: jyut6 hoi2 gwaan1 bou6 gaam1 duk1), informally known as the "Hoppo", and the Governor-general of Guangzhou and Guangxi.