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Vast areas of Middle, Central, and East Asia, particularly in the Huang He (Yellow River) basin, are covered with loess (a loamy unstratified deposit formed by wind or by glacial meltwater deposition); the thickness of these deposits on the Loess Plateau of China sometimes exceeds 1,000 feet (300 metres). There are broad expanses of badlands, eolian (wind-produced) relief, and karst topography...
...the lofty Tsou-lang-nan and Ch’i-lien ranges separate Kansu from Tsinghai. These ranges have an average elevation of 12,900 feet (3,900 metres) above sea level. Near Lan-chou in central Kansu, the Huang Ho valley opens out, and excellent agricultural land is available. Some 120 miles (190 kilometres) northwest of Lan-chou there is a stretch of interior drainage where the land is relatively...
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