Aspects of this topic are discussed in the following places at Britannica.
...or another of the slopes. Only two passes allow a relatively easy crossing in a single ascent—these are the Kandevān Pass, between the Karaj and the Chālūs rivers, and the Gadūk Pass, between the Hableh and the Tālā rivers. The main divide runs generally south of the highest crest, which—with the exception of the towering and isolated cone of...
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