Chongqing. Chongqing is called "Chongqing" for short, and it is also called "Mountain City". Chongqing is a city built on a mountain, and many building facilities in its towns are placed on rugged terrain. It is a provincial administrative region, municipality directly under the Central Government, national central city and megacity in People's Republic of China (PRC), one of the important central cities in China, the economic center in the upper reaches of the Yangtze River, an important modern manufacturing base in China and a comprehensive transportation hub in southwest China, with the approval of the State Council. With a total area of 82,400 square kilometers, it governs 26 districts, 8 counties and 4 autonomous counties, with a permanent population of 3 1.2432 million, an urban population of 20,869,900 and a permanent population of 1.6765 million. Located in the southwest of China, Chongqing is the center of economy, finance, science and technology, shipping and commerce logistics in the upper reaches of the Yangtze River, a national logistics hub, an important strategic fulcrum for the development of the western region, an important connection point between the Belt and Road and the Yangtze River Economic Belt, and a scenic inland open highland. It is famous not only for Jiangcheng, Wudu and Qiaocheng, but also for its mountain city. Chongqing is dominated by the Han nationality, and ethnic minorities mainly include Tujia and Miao. Rich in tourism resources, including the Three Gorges of the Yangtze River, Dazu Stone Carving, Wulong Karst, Nanchuan Jinfo Mountain, etc.