N either of the zones of latitude 15–30° N and S characterized by very low rainfall and desert or semidesert terrain 干旱带
These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone.
这些河流和河川系统被称作“外源河流”，因为它们的源头位于干旱地区之外。
Arid Zone Geomorphology: Process, Form and Change in Drylands, Third Edition.
干旱区地貌：旱地过程，形式和变化，第三版。
The landscape ecological construction in continental river basin in arid zone.
干旱区内陆河流域景观生态建设。
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