Chengdu: Chengdu, referred to as Rongcheng and Jincheng for short, is the capital of Sichuan Province, the only sub-provincial city in southwest China, a mega-city, an important national high-tech industrial base, commercial logistics center and comprehensive transportation hub, and an important central city in western China.

Shanghai: Shanghai, referred to as "Shanghai" or "Shen" for short, is the birthplace of China, a municipality directly under the Central Government of the People's Republic of China, a national central city, a megacity, a core city of Shanghai, Hangzhou and Ningbo, an international economic, financial, trade, shipping and scientific and technological innovation center, and the first batch of coastal open cities.

Beijing: Beijing, referred to as "Beijing" for short, is the capital, municipality directly under the Central Government, national central city, megacity, international metropolis, national political center, cultural center, international exchange center and scientific and technological innovation center of People's Republic of China (PRC).

Xiamen: Xiamen, which belongs to Fujian Province, is also called Ludao, the abbreviation of Heron, a sub-provincial city, a special economic zone, an important central city, port and scenic tourist city in the southeast coast.

Chongqing: Chongqing, referred to as Chongqing or Pakistan for short, is the only municipality directly under the central government, national central city, mega-city and international metropolis in central and western People's Republic of China (PRC), the economic, financial, scientific and technological innovation, shipping, trade and logistics center in the upper reaches of the Yangtze River, 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 an inland open highland.

Xi 'an: Xi 'an, formerly known as Chang 'an and Haojing, is the capital of Shaanxi, a sub-provincial city, the core city of Guanzhong Plain urban agglomeration, the starting point city of the Silk Road, the core area of the Belt and Road, an important central city in western China, and an important national scientific research, education and industrial base.

Extended data:

Land territory: Chinese mainland and its coastal islands, Taiwan Province Province and its affiliated islands, dongsha islands, Xisha Islands, zhongsha islands, Nansha Islands and all other islands belonging to People's Republic of China (PRC) (including Diaoyu Island and Su Yan Reef), with a land territory of about 9.6 million square kilometers.

Marine land: the whole Bohai Sea and most of the Yellow Sea, East China Sea and South China Sea and their exclusive economic zones under their jurisdiction, totaling about 4.7 million square kilometers, of which the whole sea area within the nine-segment line of the South China Sea is about 3 million square kilometers.

China's airspace is 35 kilometers above its territory and territorial waters. The coastline of the eastern and southern continents is more than 1.84 million kilometers long, the coastline of the islands is more than1.40 million kilometers long, and the water area of the inland sea and marginal sea is about 4.7 million square kilometers. There are 7,600 large and small islands in the sea area, of which Taiwan Province Island is the largest, with an area of 35,989.76 square kilometers. The land border is more than 20,000 kilometers long, and the land borders 14 countries and the seas of 6 countries.

Land area: the land area is 9.6 million square kilometers, accounting for about115 of the world's total land area, ranking third in the world. The eastern region accounts for 10.5%, the central region accounts for 25.3% and the western region accounts for 64.2%.

Land resources: 3.2 million square kilometers of mountains, 2.5 million square kilometers of plateaus, 6.5438+0.8 million square kilometers of basins, 6.5438+0.65438+0.5 million square kilometers of plains and 950,000 square kilometers of hills (up to 654.38+0.997).

References:

People's Republic of China (PRC) (China)-Baidu encyclopedia