The Khyber Pass, (Pashto: د خیبر درہ, Urdu: درۂ خیبر) (altitude: 1,070 m or 3,510 ft) is a mountain pass linking Pakistan and Afghanistan. The Pass was an integral part of the ancient Silk Road and throughout history, it has been an important trade route between Central Asia and South Asia and a strategic military location. The summit of the Khyber Pass is 5 kilometres (3.1 mi) inside Pakistan at Landi Kotal and it cuts through the northeastern part of the Safed Koh mountains which themselves are a far southeastern extension of the Hindu Kush range.