Guangzhou is the capital of the Guangdong province. It is the most important place for business in China, so called "the factory of the world". With population of about 14 millions it is the 3-rd biggest city in China. It is a port on the Pearl River, to the South China Sea, and is located about 120 km (75 miles) northwest of Hong Kong.In the ancient times it was very important for the trading of silk on the "silk road".

Hong Kong Special Administrative Region is located on the Pearl River Delta in China, bordering the province of Guangdong to the north and facing the South China Sea to the east, west and south. It has a population of 6.9 million people, and is one of the most densely populated areas in the world.

Shenzhen is a city of administrative status in southern China's Guangdong province, situated immediately north of Hong Kong. Owing to China's economic liberalization under the policies of reformist leader Deng Xiaoping, the area became China's first—and ultimately most successful—Special Economic Zone