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Topography
Gansu adjoins the Loess, Inner Mongolia, and Qinghai-Tibet plateaus, averaging 1,000- 3,000 metres in elevation. The eastern part, composed of the undulating Loess Plateau, is drained by the Yellow River and its tributaries, the Weihe and Taohe, and has potential for the development of hydropower. The Bailong River valley south of the Qinling range has a warm, humid climate for lush plant growth. The Qilian Mountain Area on the Gansu-Qinghai border generally exceeds 4,000 meters above sea level. There are the Heihe, Shule and other inland rivers in the Gansu Corridor between the Qilian range and the Longshou and Heli mountains. Although the greater part of the Corridor is deserts and semi-deserts with an arid climate, there are contiguous oases Which have the benefit of the melt-water from the Qilian Mountains for the development of farming and animal husbandry. A natural passage from the heartland of China to Xinjiang and Central Asia in ancient times, the Gansu Corridor is crossed by the Lanzhou-Xinjiang Railway.

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