from 3 - The major regions of the empire
Published online by Cambridge University Press: 28 March 2008
Geographical survey
Central Asia consists of three hydrographic basins, namely the Aral Sea to the north, Lake Hamun to the south of the Hindu Kush, and the Lob Nor and Tarim east of the Pamirs. To the first belong the great rivers Syr Darya (Jaxartes) and Amu Darya (Oxus) and the important tributaries of the latter whose waters sometimes run to waste before they join the main stream. The Helmand and the Farah Rud, with their tributaries, belong to the second basin; the Atrak and the area of the Caspian belong to a separate system. The territory is bounded by the Mongol, south Siberian and Kazakh steppes, the Caspian Sea, the desert of Seistan, the Indus basin, the Pamirs and the Himalayas, and the part relevant to the Achaemenids is situated between 55° and 75° longitude east and between 30° and 45° latitude north.
This area can best be divided into a highland and a lowland zone. The mountains include the Hindu Kush, the Pamirs, the Alai, Tian Shan, Altai and their foothills, while the lowlands stretch out along the banks of the Amu Darya and in Seistan, in Xinjiang, Djungaria, Tuva and Mongolia.
Within the highland zone, we must distinguish, because of their different natural resources, between the valleys on one hand and the mountains and plateaux on the other. The high, cool, plateaux provide pasture, means of communication and mineral resources; irrigation in the valleys results in a stable and dense population.
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