Henry Francis Brooke, Private Journal of Henry Francis Brooke
“ It is, however, never more than a couple of feet deep, and from ten to fifty yards wide. The whole of the road from Pir-Chokey to Dirwaza (78 miles) is called the Bolan Pass, and most of the way is properly so called, though there is a great plain of 20 miles across, which, though surrounded in the distance by hills, has none of the appearance of what one understands as a Pass. For the first 12 miles the road is indeed a pass or gorge in the mountains, as in places the cliffs are not more than 60 to 100 yards apart, and rarely open out to more than 150 to 200 yards apart. ”
