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Lanzhou, referred to as "Lan" and "Gao", was called Jincheng in ancient times. It is a prefecture-level city, provincial capital and type II big city under the jurisdiction of Gansu Province, an important industrial base and comprehensive transportation hub in the northwest of China, one of the important central cities in the western region, and an important node city in the Silk Road Economic Belt approved by the State Council. As of 202 1, there are five districts and three counties in the city, with a total area of 1.3 1 10,000 square kilometers, with a permanent population of 4,384,300 and an urban population of 3,663,500, with an urbanization rate of 83.56%.
Lanzhou is located in the geometric center of northwest China and Chinese mainland. It has a history of more than 2000 years since the Qin Dynasty. Since ancient times, it has been a transportation hub and military fortress of "connecting all directions and taking Wan Li first". Named Jincheng, it means "Jincheng Tang Chi" and is known as the "Pearl of the Yellow River".