Hexi corridor or Gansu corridor, to the west of the Yellow River, has always been a must of the Old Silk Road. This is really a narrow but long stretched passage lasting for 1200 km from steep Wushaolin hillside to Xinxinxia gorge at the border of Gansu and Xingiang. There are many fertile oasis surrounded by vast expanse of Gobi-desert, sandwiched in between snow-covered Qilian Mountain to the south and north mountain and deserts to the north.