That western Ka-shun region is bounded by the Pei and Tien Shan Mountains, while the Ala-Shan in the south is partly skirted by the Huang-Ho River.  
Its northern border is defined by the Hangayn Mountains and the Greater Khingan Range to the east.  Among the regions it is divided into include the Ka-shun in the west and the Ala Shan in the south.  That western Ka-shun region is bounded by the Pei and Tien Shan Mountains, while the Ala-Shan in the south is partly skirted by the Huang-Ho River.  FTP, identify this region coming from the native word for "waterless place," a desert stretching across China and Mongolia.
Its northern border is defined by the Hangayn Mountains and the Greater Khingan Range to the east.  
Gobi Desert