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我区地貌形态有沙漠、山地、丘陵、高原、平原、洼地等,地势起伏,变化较大。地形以丘陵、山地为主。丘陵占全区总土地面积的48.8%,山地占26.3%,平原占21.4%,洼地占3.5%。主要山脉有大兴安岭、燕山,阴山、狼山和贺兰山等,大体构成了自东北向西南的带状山体。这条山体是我区地表水系外流区和内流区(内陆河)划分的重要依据。由于山体、地形、地貌、水汽来源等综合影响,使我区河流泥沙分布显示了复杂多变的特点。
The topography of our region is desert, mountain, hills, plateaus, plains, depressions and other terrain, ups and downs, great changes. The terrain to hills, mainly mountains. The hills account for 48.8% of the total land area of the region, with 26.3% of the mountains, 21.4% of the plain and 3.5% of the lowland. The main mountains are Daxinganling, Yanshan, Yinshan, Langshan and Helan Mountain, etc., generally formed from northeast to southwest ribbon mountain. This mountain is an important basis for the division of the outflow area and the inflow area (inland river) of the surface water system in our district. Due to the comprehensive influence of mountain, topography, landform and water vapor, the distribution of sediment in the river shows a complex and changeable characteristics.