In the west the northern highlands develop two branches: (I) the Kuren Dagh, stretching through the Great and Little Balkans to the Caspian at Krasnovodsk Bay, (2) the Ala Dagh, forming a continuation of the Binalud Kuh and joining the mountains between Bujnurd and Astarabad, which form part of the Elburz system.
The central range seems to be higher, culminating with the ShahJehan Kuh (1r,000) and the Ala Dagh (11,500).
The southern ridges, although generally much lower, have the highest point of the whole system in the Shah Kuh (13,000) between Shahrud and Astarabad.
This system, sometimes spoken of collectively as the Kuren Dagh, or Kopet Dagh from its chief sections, forms in the east three ranges, the Hazar Masjed, Binalud Kuh and Jagatai, enclosing the MeshedKuchan valley and the Jovain plain.
Runs almost due south to the border of Seistan in 31 N., and then through Seistan follows the line fixed by Sir Frederick Goldsmids and Sir Henry McMahons commissions in 1872 and1903-1905to Kuh i Malik Siah.
The highest of the mountains of Fars (14,000 ft.) is the Kuh Dina in the northwestern part of the province.
The part of the Elburz immediately north of Teheran is known as the Kuh i Shimran (mountain of Shimran, from the name of the Shimran district on its southern slopes) and culminates in the Sar i Tochal (12,600 ft.).
In height, the Shahan Kuh, Kuh-iGerra, Zardeh Kuh and Kuh-i-Karan (by some writers called Kuh-i-Rang), all in the Bakhtiari country west of Isfahan, are 12,800 to 13,000 ft.
From Meshed by the direct road, in a fertile valley running east and west, of which the southern boundary is a lofty range of barren hills known as Kuh i Bakeran.