What does not belong to the northern dialect area of Chinese?

Shangjiang Mandarin does not belong to the northern dialect area of Chinese.

Southwest Mandarin, mainly popular in the upper reaches of the Yangtze River, also known as Shangjiang Mandarin, belongs to the dialect of modern Mandarin [1]. Southwest Mandarin is divided into 6 pieces and 22 pieces, which are distributed in Sichuan, Chongqing, Guizhou, Yunnan, Hubei, Guangxi, Hunan, Shaanxi, Jiangxi, Gansu, Guangdong, Hainan, Fujian *** 15 provinces, cities and autonomous regions, more than 600 counties and cities and a few areas in Southeast Asia.

Mainly distributed in Sichuan, Chongqing, Guizhou, Yunnan, Hubei, Guangxi, Hunan and other provinces and municipalities directly under the central government.

The definition given by Atlas of Chinese Language is that all the Chinese dialects in the southwest and its vicinity are classified into a certain tone or four tones similar to those in Chengdu, Wuhan, Chongqing, Changde, Guiyang, Kunming and Guilin.

Southwest Mandarin is a Mandarin dialect gradually formed by emigrating to the southwest from the Ming Dynasty, and its phonetic system is also the simplest in Mandarin. Apart from the similarities in voiced and unvoiced sounds, most of Southwest Mandarin are transitional Southern Mandarin.

As many as 270 million people use Southwest Mandarin, which is the most widely used and populous dialect in Mandarin. According to the research of general historians, Southwest Mandarin is an extension of Jianghuai Mandarin, and both of them are related and belong to Southern Mandarin, because according to historical research, the formation of Southwest Mandarin is a mandarin dialect gradually formed from the Ming Dynasty due to immigration to the southwest, and immigration is the main factor in the formation of Southwest Mandarin.

The formation of Southwest Mandarin is closely related to the immigrants who entered the southwest of China after the Yuan Dynasty. The time of Chengdu-Chongqing Sichuan dialect and Huguang-Wuhan phonology can be traced back to at least the Ming Dynasty, so the formation of Southwest Mandarin should be earlier.

At the same time, some scholars believe that it may have the same origin as another southern mandarin (Jianghuai Mandarin). Compared with Northern Mandarin, Southwest Mandarin has significant differences in vocabulary and phonology.