To the south of Zhob and west of the *Sulaiman Range lies a north-south hilly range that has historically presented a barrier between the territories of the Persian and Indo-Gangetic empires. High cliffs in the Brahui Range give way to deep valleys with stony river beds, which remain dry for most of the year. The braiding rivers tum into raging torrents in the flash floods of summer. 'The Bolan Pass' at the northern end of the range has been of importance throughout history.
This famous pass links Quetta to the rest of Pakistan via a main road and rail way. The pass itself is approximately 1,792 metres above sea level. In prehistoric times this route was used by nomads and travelers to journey from Central Asia to the subcontinent. It is an easier route than the *Khyber Pass to the north. Officially 96 kilometers long, the western end starts with a dramatic, narrow winding 15 kilometers gorge. Villages dating from 7,000 BC onwards have been excavated beyond the eastern end of the pass at Mehrgarh.

