The landforms in Gansu are complicated and varied. High mountains and deep valleys aloft on its southeastern part with peaks rising one higher than another. Covered by loess, a loess topography has formed in its eastern part. Hexi Corridor, the western fringe of the province has smooth terrain, oasis, dessert and Gobi desert. With cold climate and modern glacier, the terrain is highly situated in the southwestern part of the province.The highest peak of the province is Tuanjie Peak of Qilian Mountain with an altitude of 5,808 meters above sea level and its lowest point is the bottom of Bailongjiang River valley in the eastern part of Wenxian county with an altitude of only 550 meters above sea level. There are 450 rivers in Gansu, among which 78 rivers have a yearly runoff of over 100 million cubic meters each..