一、地下水形成的自然地理和地質构造特点敦熄凹地的范圍包括王門、安西、敦煌三县的大部分,文中所描述的范围东起玉門县城,西至哈拉湖,南起昌馬盆地和石包城盆地北緣的一列山脉,北至安西以北的低緩山地,包括疏勒河中下游的大部分地区,位于河西走廊的西端。敦煌凹地位于祁連山与馬鬃山之間,东部南北寬 First, the formation of groundwater characteristics of the natural geography and geological structure of the range of outreach include Wangmen, Anxi, Dunhuang most of the three counties, the scope of the article described east Yumen County, West to Hala Lake, South from the Changma Basin And a range of mountains on the northern margin of the ShiPuCheng basin and a gentle slope to the north of Anxi to the north, including most of the middle and lower reaches of the Shule River, at the western end of the Hexi Corridor. Dunhuang depression is located between the Qilian Mountains and Mazong Mountain, east and south wide