Andarab is the name of a large stream in Afghanistan and of the valley it empties into.
The stream originates in the Hindu Kush, near Khawak Pass, and flows to the west for about 75 miles before merging into the Surkhab.
Both parts of the valley had been united governmentally under a single leader, or hakim, who lived at Bannu, in modern-day Pakistan.
However, Andarab stays comparatively cooler during the summer, though it gets quite hot in Khinjan and Doshi.
[1] At the turn of the 20th century, it was estimated that there were about 2,600 families living in the Andarab valley and the latest population statistics are not available.