Proper noun
Paropamisus
(historical) A region of eastern Afghanistan ruled by the Greeks around the time of Alexander the Great, variously considered a satrapy of Persia, a region of India, and an autonomous people.
The passes of the Paropamisus in the west are relatively low, averaging around 600 meters; the most well-known of these is the Sabzak between the Herat and Badghis provinces, which links the western and northwestern parts of Afghanistan. Source: Internet