位于陕蒙边界上的红碱淖,周围是毛乌素沙漠,沙丘沙梁起伏连绵,四周地形较高,中心地势较低,形成了陕西境内最大的湖泊——红碱淖。该湖积水面积56km~2,水深6～7m,最大10.6m,蓄水量3.61×10~3m~3。是一个目前仍在扩大的活湖。国家测绘总局1956年测制的万分之一地形图,湖面仅30.87km~2,1988年,湖面为57.60km~2。据当地相传,湖的形成是近60—70年的历史。由于红碱淖的存在,使周围自然环境不断得到改善,呈现出农牧鱼业兼为丰收的陕北小江南生活。红碱淖形成的地质背景因湖区位于鄂尔多斯盆地北部,区内地层平缓、地质构造简单。中侏罗统含煤岩系沉积之后,本区经历了白垩纪、第三纪的长期风化、剥蚀作用,形成了起伏不平的基岩面古地形。第四纪以来,新构造运动在区 Located on the border of Shaanxi and Mongolia, the Rhinopithecus ramosissima is surrounded by the Mu Us Desert. The sand dunes of the dune ups and downs are rolling. The terrain is high around and the terrain of the center is relatively low. Thus, the largest lake in the territory of Shaanxi Province, Rhinopithecus konjac has been formed. The lake has a water area of ​​56km ~ 2, a depth of 6 ~ 7m, a maximum of 10.6m and a water storage capacity of 3.61 × 10 ~ 3m ~ 3. It is a living lake that is still expanding. In 1956, the State Survey and Mapping Administration made a one-ten-thousandth topographic map with only 30.87km ~ 2 lake surface. In 1988, the lake surface was 57.60km ~ 2. According to local legend, the formation of the lake is nearly 60-70 years of history. As a result of the existence of Hongjiannao, the surrounding natural environment has been continuously improved, showing a combination of agriculture and animal husbandry, fishing and small northern Shaanxi life. The geological background of Hongjiannao Formation is that the lake area is located in the north of Ordos Basin. The strata in the area are gentle and the geological structure is simple. After the sedimentation of the Middle Jurassic coal-bearing rocks, the area underwent long-term weathering and denudation in the Cretaceous and Tertiary, forming the undulating topography of bedrock surface. Since the Quaternary, Neotectonic movement in the area