The Caucasus, the Elburz, the Kopet-dagh and Paropamisus, the intricate and imperfectly known network of mountains W.
Foot of the Kopet-dagh range.
It is separated from (3), the southern and deepest section of the Caspian, by a submarine ridge (30 to 150 fathoms of water), which links the main range of the Caucasus on the west with the Kopet-dagh in the Transcaspian region on the east.
Taking the Kuren Dagh or Kopet Dagh to form the northern scarp of this plateau east of the Caspian, we find a prolongation of it in the highlands north of the political frontier on the Aras, and even in the Caucasus itself.
On the east the watershed of the Caspian gradually increases in breadth, the foot of the scarp extending considerably to the north of the south-eastern angle of that sea, three degrees east of which it turns to the south-east, parallel to the axis of the Kopet Dagh.
Blanford divided Persia into five zoological provinces: (1) the Persian plateau, or from the Kopet Telegraph.5 Dagh southwards to nearly 28 N.
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.
It is, however, continued under the waters of the Caspian, as stated in the article on that sea, and reappears on its eastern side in the Kopet-dagh, which skirts the north-east frontier of Persia.