Chengguan Town Commercial Street. Gaotai County, which belongs to Zhangye City, Gansu Province, is located in the middle of Hexi Corridor in Gansu Province, in the middle and lower reaches of Heihe River. Since ancient times, it has been called "the lock and key in Hexi, the throat of five counties", and the beauty shop in the county is located in the commercial street of Chengguan Town. Gaotai County is high in the north and south, low in the middle, with the northern foot of Qilian Mountain in the south, the Mount Heli in the north, the oasis plain in the middle, and the Heihe River running through the county. The total land area of the county is 4346.6 1 km2, and there are 9 towns under its jurisdiction.