Shenzhen is the fifth most populated city of China. This aims to contain information about Shenzhen, a sub-provincial city of Guangdong province in southern Mainland China, right next to Hong Kong. In 1980, it became China's first "special economic zone". While it is located in the province of Guangdong, which has Cantonese as its primary language, the city of Shenzhen is a city dominated by the use of Mandarin in both government and everyday business.