The geographical coordinates of Zhangye City are 97 20 ′ to 65 438+002 65 438+02 ′ east longitude and 37 28 ′ to 39 57 ′ north latitude. It is 465 kilometers long from east to west, wide from north to south 148 kilometers, and 1200 meters to 5565 meters above sea level. It is located in the transition zone between Qinghai-Tibet Plateau and Inner Mongolia Plateau. The total land area is 42,000 square kilometers, accounting for 9.2% of the province. Qilian Mountain in the south, Menyuan County and Qilian County in Haibei Tibetan Autonomous Prefecture in Qinghai Province in the north, Helishan Mountain and Longshou Mountain in the north, Ejina Banner and Alashan Right Banner in Inner Mongolia, with a corridor plain in the middle, with a long and narrow region, smooth east-west flow and abundant water and food. Since ancient times, it has been the channel and gateway of east-west traffic. In ancient times, the ancient "Silk Road" from eastern China to Xinjiang, India, Pakistan, Central Asia and other places crossed the region, Zhang Qian connected the western regions, Kyle Polo traveled eastward, and Xuanzang The Journey to the West passed through here. Lanzhou-Xinjiang double-track railway is one of the most important railway trunk lines in modern China, which runs through the whole thing. National Highway 3 12 and National Highway 227 meet here, forming convenient conditions for developing export-oriented economy, expanding opening up and commodity import and export.