The West Triangle Economic Zone is an economic zone designated by the Chinese government comprising Chengdu, Chongqing and Xi'an. Created as part of China's Western Development strategy, the West Triangle Economic Zone contributes nearly 40% of Western China's GDP. Furthermore, Chongqing is one of China's five National Central Cities, while both Chengdu and Xi'an are Regional Central Cities.

Chongqing is a municipality in Southwestern China. Chongqing is one of the four direct-administered municipalities under the Central People's Government, along with Beijing, Shanghai, and Tianjin. It is the only directly administrated municipality located deep inland. The municipality covers a large geographical area roughly the size of Austria, which includes several disjunct urban areas in addition to Chongqing proper. Due to its classification, the municipality of Chongqing is the largest city proper in the world by area, though it does not have the largest urban area.