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北山在地理上并无确切的界线,一般习惯将河西走廊以北、直至中蒙边境的诸山脉统称北山。这个范围在地质构造上包括北天山优地槽褶皱带、库鲁克塔格—马宗山台缘隆起带及北山优地槽褶皱带等三个单元。本文所指北山在地理上仅限于新疆东部和甘肃西部的穹塔格—马宗山以南和河西走廊以北的低山丘陵地区。大致范围:东起于北山煤窑、双堡塘以东,向西经红柳园、古堡泉、白山、依格孜塔格、因尼卡拉塔格,西止于罗布泊凹地东缘。东西长约750公里,南北宽约80—100公里的峡长地带(图1)。
Beishan does not have a definite geographical boundary. It is customary to call Beishan mountains north of the Hexi Corridor and up to the border between China and Mongolia. This range includes three units in the geological structure, such as the Youtigou fold belt in the North Tianshan Mountains, the uplift belt in the Kuruktag-Mazong Mountain, and the fold belt in the Beishan Youdian groove. This article refers to the North Mountain Geographically limited to the eastern Xinjiang and western Gansu, the Qiongtaige - Mazong Mountain and Hexi Corridor north of the hilly areas. Rough range: From Beishan coal kiln, east of Shuangbao Tang, west of Hongliuyuan, Old Fort Spring, Baishan Mountain, Inge Zitag, Innekalatag, west end in the eastern margin of Lop Nur. Some 750 km east-west, north-south width of 80-100 km long gorge (Figure 1).