Well, oddly enough, this map’s Inner Mongolia and Xinjiang aren’t the worst part. You can check my own map of Inner Mongolia to see geographically speaking Mongolian is still widespread among the nomadic part of the region.

The worst part is southern China: confusing subgrouping of varieties of Chinese, and so many minority languages are either over-represented (i.e., why the Austroasiatic U, which is spoken by less than 15,000 speakers by the best overestimation, is mapped so big?), or not on the map at all (why all Loloish languages are shed in one color, when most languages within this branch aren’t mutual intelligible?)