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官厅山峡地区位于北纬39°58′至40°14′,东经115°36′至116°10′。其范围北起永定河官厅水库以下,南至百花山,西界东灵山与河北省涞水、涿鹿交界,东临西山,妙峰山。总面积1600平方公里,其中北京市属140O平方公里,占总面积87.5％。该地区除少数黄土区外,北京市辖多为石质山区、山脉属太行山余脉。地势西北高东南低,高峰灵山2303米,次高峰1990米,最低外三家店是山峡出口所在,海拔高仅106米,相对高差2197米。 由于山高坡陡形势险要,每逢暴雨洪水东下,
Guanting Mountain Gorge area is located at latitude 39 ° 58 ’to 40 ° 14’ and longitude 115 ° 36 ’to 116 ° 10’ long. The scope of its north from the Yongding River Guanting reservoir below, south to Mount Baihua, west of the East Lingshan and Hebei Province Lushui, Zhuolu junction, east of Xishan, Miaofeng Hill. The total area of 1600 square kilometers, of which Beijing city is 140O square kilometers, accounting for 87.5% of the total area. In addition to a small number of loess areas in the region, mostly in Beijing Municipality for the rocky mountain, mountain range is the Taihang Mountains. The terrain northwest southeast low 2303 meters peak Lingshan, sub-peak of 1990 meters, the lowest outside the three stores is the exit of the mountain gorge, the elevation of only 106 meters, the relative elevation of 2197 meters. Due to the steep slope of the mountain slope danger, whenever the storm flood east,