Dongguan, also known as Guancheng, is a prefecture-level city in Guangdong Province and one of the five prefecture-level cities without districts in China. It is located in the southeast of Guangzhou, on the east bank of the Pearl River Estuary and adjacent to Shenzhen in the south. It is an international garden city, a national civilized city, a national basketball city, an important transportation hub and a foreign trade port in Guangdong. Founded in the Three Kingdoms period, it has a history of 1700 years. It is an important birthplace of Lingnan civilization, the beginning of China's modern history and the forerunner of reform and opening up.