History of Bayingolin
Bayingolin is an autonomous prefecture for Mongol people in the southeast of Xinjiang Uyghur Autonomous Region, Western China. It borders Gansu to the east, Qinghai to the southeast, and the Tibet Autonomous Region to the south. It is the largest prefecture-level division nationally, with an area of 462,700 km2 (178,600 sq mi), even larger than its neighbouring province of Gansu. The prefectural capital is Korla.
Source From: https://en.wikipedia.org/wiki/Bayingolin_Mongol_Autonomous_Prefecture