Yunnan, Guizhou and Sichuan are collectively called the three southwestern provinces. Yunnan is the abbreviation of Yunnan and Guizhou is the abbreviation of Guizhou.

Because of the Yunnan-Guizhou Plateau and mountainous areas, the traffic is not very convenient.

Entering Yunnan from the Central Plains must pass through Anshun, so it is called "the throat of Yunnan"

Anshun, located in the middle of Guizhou, is an important town in the middle of Guizhou, so it is called "the belly of Guizhou".