What is "tirah"

The Tirah region, also called the Tirah Valley , is located in Khyber, Kurram and Orakzai agencies of the Federally Administered Tribal Areas of Pakistan (33.73N 71.01E), while its smaller part straddles the border to the north lying in Nangarhar Province, Afghanistan. Tirah lies between the Khyber Pass and the Khanki Valley. It is inhabited by the Afridi, Orakzai and Shinwari tribes of Pashtuns.