The dry environment encompasses the area from northern areas with rain-dependent agriculture to the south where irrigation agriculture is essential. The irrigation was aided by high water levels and snow melt from the peaks of the northern Mountains, and from the Armenian Plateau, the source of the Tigris and Euphrates rivers, by which the region was named. The usefulness of irrigation depends on the ability to mobilize sufficient labor for the construction and maintenance of canals, and has, since the earliest period, contributed to the development of urban settlements and centralized systems of political power.
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