Siahan Range - Drainage

Drainage

The Rakshan tributary of the Mashkel River carries off all the drainage from the southern slopes. On the north a number of hill torrents descend, either to lose themselves in the Kharan Plain or to join the Mashkel River. Some of the more important are the Gujjar, the Regintak, the Gresha Kaur, the Palantak, the Pillin, the Bibi Lohri and the Barshonki.

Of the two gorges already mentioned the Tank-e-Grawag lies in the Koh-e-Sabz and the Tank-e-Zurrati in the northern ridge of the Siahan Koh. The former is so termed from the reeds called Grawag which grow here in great abundance. There is also a small patch of cultivation where a few date palms grow at the point where it makes its first turn. It is six miles in length and is easily passable when the river is low, but is subject to great and violent floods. The latter is just over eight miles long and of medium width, being nowhere less than 80 yards and generally nearly 150. The perpendicular cliffs which enclose it are about 200 feet in height. Quicksands exist at some of the fords and there is perennial water in both defiles.