云南东部与贵州西部位于云、贵、川三省的交界之处,是云南和贵州北进四川的重要门户,它与四川省的凉山州、宜宾市隔金沙江而望。滇东黔西地区是西南地区一个特殊的地理单元,地处云贵高原东麓,它是四川南部、云南东北部和贵州西部“三省鸡鸣”之地。本文所讨论的区域主要是指云南东北部、贵州西部、广西西北部的个别地区,东部属于乌蒙山系,西部则属于横断山区凉山山脉的五莲峰,在地理单元上呈立体分布,属于西南地区第二阶梯与第三阶梯之间,多高山和高原,属于典型的山地高原构造。该 Eastern Yunnan and western Guizhou are located at the junction of the three provinces of Yunnan, Guizhou and Sichuan. They are an important gateway to Sichuan of Yunnan and Guizhou northward. They are located across the Jinsha River from Liangshan Prefecture and Yibin City in Sichuan Province. East Yunnan is a special geographic unit in the southwest region, which is located in the eastern foot of the Yunnan - Guizhou Plateau. It is the land of southern Sichuan, northeastern Yunnan and western Guizhou. The areas discussed in this paper mainly refer to the individual areas in northeastern Yunnan, western Guizhou and western Guangxi, with Wumeng Mountain in the east and Wulian Peak in the Liangshan Mountains in the Hengduan Mountains in the west, which are in three-dimensional distribution on the geographical units and belong to the southwest Between the second and third steps of the region, the mountains and plateaus, belonging to the typical mountain plateau structure. This