Siahan Range

It forms the main ridge at the western extremity of the mass, but at the eastern end, a more southerly range predominates.

The Koh-e-Sabz is only well defined to the west of the Korkian Pass, from which place it gradually rises to a height of nearly 5400 ft before it is crossed by the defile known as the Tank-e-Grawag.

On the other hand, the Kharan-Rakshan Lath descends gradually toward Jang-ja-e-gajiun in Panjgur, and forms the hilly country between the latter place and the Koh-e-Sabz.

The Koh-e-sabz portion is composed of shale and volcanic rock, contorted in many places into fantastic shapes with synclinal and anticlinal curves.

The shale which lies throughout in perpendicular parallel layers or at a slight angle to its base, gives the hill a very sharp and jagged appearance, but though difficult they are not unscalable, very steep and precipitous escarpments being rare and generally limited to the sides.

The range possesses no permanent inhabitants; among the nomads who pasture their flocks on it are the Muhammad Hasnis, Nasrois, Bullozais, Sopaks and Hajizais of the Rakshan valley and a few people from Kuhak called Siahani.

The range is crossed by numerous footpaths and trails, which are used by Balochistani people, including the Simmij, Sabzap, Kasag, Miani, Sorani, and Sechi.