The Hazarajat lies in the central highlands of Afghanistan, among the [[Koh-i-Baba|Koh-i Baba mountains]] and the western extremities of the [[Hindu Kush]]. Its boundaries have historically been inexact and shifting. Its physical boundaries, however, are roughly marked by the Bā-miān Basin (see BĀMIĀN ii.) to the north, the headwaters of the Helmand River (q.v.) to the south, Firuzkuh to the west, and the [[Unai Pass]] to the east. The regional terrain is very mountainous and extends to the Safid Kuh and the Siāh Kuh mountains, where the highest peaks are between 15,000 to 17,000 feet. Both sides of the Kuh-e Bābā range contain a succession of valleys. The north face of the range descends steeply, merging into low foothills and short semi-arid plains, while the south face stretches towards the Helmand Valley and the mountainous district of [[Markazi Bihsud District|Behsud]].