The Pearl River, the largest river system of southern China that flows through Guangzhou, is the third longest river in China, only second to the Yangtze River and the Yellow River.
The Pearl River Delta is one of the most developed regions in China with an area of about 11,000 square kilometers.
It is also the greatest urban areas in both size and population all over the world.
The nine largest cities of the Pearl River Delta totally have a population of more than 57 million. Since the Chinese reform and opening up in the late 1970s, the Pearl River Delta has become one of the major economic regions and manufacturing centers in China and the world.