The ancient Iranian peoples seem to have given this name to the tallest mountains in any area that they happened to live (exactly as the Turkic people did when they called all the tallest mountains in their sight, "Qaradağ"/Karadag, with the term qara/kara standing for great/big, as well as color black).
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They stretch for some 100 km north-west to south-east, parallel to the Halil Rud, to the north-east of Jiroft and to the south-west of Bam, rising to a maximal elevation of 3,400 m.