西部地区是我国西南、西北及中部不发达的内蒙、广西、中东部欠发达的部分地区的总称。土地面积682.6万平方公里,占全国土地面积的71.4%,全国最大的八个省有七个在西部。西部地区大多为山岭重丘区,山高谷深,地形复杂,特殊地质如滑坡、泥石流崩塌、岩溶、雪崩、风沙、冻土、膨胀 The western region is a general term for parts of the underdeveloped areas of Inner Mongolia, Guangxi and the Middle East, which are underdeveloped in the southwest, northwest and central regions of our country. The land area of ​​6.826 million square kilometers, accounting for 71.4% of the country’s land area, seven of the country’s eight largest provinces in the west. Most of the western region is a mountainous heavy hilly area, with deep mountains and valleys, complex topography, special geology such as landslides, debris flow collapse, karstification, avalanches, sand blisters, frozen soil, swelling