The Histories · 3.117

Now there is a plain in Asia bounded by mountains on all sides, and through the mountains there are five clefts. This plain belonged once to the Chorasmians, and it lies on the borders of the Chorasmians themselves, the Hyrcanians, Parthians, Sarangians, and Thamanaians; but from the time that the Persians began to bear rule it belongs to the king. From this enclosing mountain of which I speak there flows a great river, and its name is Akes. This formerly watered the lands of these nations which have been mentioned, being divided into five streams and conducted through a separate cleft in the mountains to each separate nation; but from the time that they have come to be under the Persians they have suffered as follows:—the king built up the clefts in the mountains and set gates at each cleft; and so, since the water has been shut off from its outlet, the plain within the mountains is…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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