khyber pass

n. extremely important narrow mountain pass that connects Pakistan with Afghanistan

The Khyber Pass, also referred to as The Khyber (also spelt the Khaiber Pass or Khaybar Pass) (Urdu: درہ خیبر) (altitude: m , ft) is the  mountain pass that links Pakistan and Afghanistan.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 km 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.
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Noun
1. a mountain pass of great strategic and commercial value in the Hindu Kush on the border between northern Pakistan and western Afghanistan; a route by which invaders entered India
(hypernym) pass, mountain pass, notch
(part-holonym) Hindu Kush, Hindu Kush Mountains

Glass

slang. ก้น (syn. kyber pass)