Bolan Pass, a narrow, precipitous gorge between Sind and Candahar, and leading to the plateau of Dasht-i-Bidaulat, in Beloochistan. It rises 5,500 ft. in 55 miles, giving an average of 90 ft. per mile, its outlet and entry being 5,800 ft,, and 800 ft. above sea-level. A torrent flows along the bottom of the pass, bridged in many places by a military road, and there is a railway 56 miles long. The road is bounded by cliffs, which in some places almost touch each other, and are in places 800 ft. high. In 1839 a British column marched through the pass in six days. Quetta, a British fortress 25 miles away, commands the road.