Chengdu is a prefecture-level city under the jurisdiction of Sichuan Province, also known as Rongcheng and Jincheng. It is the capital of Sichuan Province, a sub-provincial city, a mega-city, a national central city, and the core city of the twin-city economic circle in Chengdu-Chongqing area. It is an important national high-tech industrial base, commercial logistics center and comprehensive transportation hub, and an important central city in the western region approved by the State Council.

Changsha, also known as Xingcheng, is a prefecture-level city, provincial capital and megacity under the jurisdiction of Hunan Province, an important central city in the middle reaches of the Yangtze River, and a central city of the Changsha-Zhuzhou-Xiangtan urban agglomeration approved by the State Council. By the end of 202 1, the whole city had jurisdiction over 6 municipal districts, 1 county and 2 county-level cities, with a total area of 1 18 19 square kilometers, a built-up area of 567.32 square kilometers and a total resident population of1020.