Where are the Muslims in China relatively concentrated?

To put it simply: more in the west and less in the east, more in the north and less in the south. Mainly distributed in northwest (Xinjiang, Gansu, Qinghai, Ningxia), Hebei, Henan, Shandong, Yunnan and other places.

Specific subregional discussions:

Northwest China: Unlike other parts of China, Muslims are basically Hui people, and the Hui people in the northwest include all ten Muslim ethnic groups in China. The whole northwest region is inhabited by Muslims. The most famous is Linxia, Gansu.

North China: Many places in Shandong Province, Hebei Province, especially Cangzhou, Hebei Province (Hui Muslim celebrities also come forth in large numbers) and Dezhou, Shandong Province. Tianmu and Hongqiao in Tianjin are also inhabited areas.

Northeast China: There are not many Muslims in Northeast China, and most of them are in Liaoning.

Central China: There are many Hui Muslims in Henan, followed by Anhui.

Southwest: Yunnan has the largest number of Muslims, and the Hui regime was established in the Qing Dynasty (Du Wenxiu). There are also some in Guizhou and Sichuan.

Southeast: The earliest Muslim settlement was in Quanzhou, Fujian in the southeast. Now there are not many Muslims, and the local Hui people are also moving closer to Islam. There are many Muslims of orthodox Arab descent in Sanya, Hainan, which is famous for being good at business and is the strongest group in the local economy.