This is Yanliang County, Zhaotong, Yunnan Province. It is located in Wumeng Mountain, the junction of Yun, Gui and Sichuan provinces in the northeast of Yunnan Province. The highest altitude in the territory is 2780 meters, the lowest altitude is 520 meters, and the relative height difference is 2260 meters. Yuliang is not only the origin of the world's Tianma, but also the hometown of military patriot Luo Xuhui, revolutionary martyr Liu Pingxu and hero Xu Honggang.