Original: The summit of the Khyber Pass is 5 k 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.
Simplified: The actual pass summit is 5 kilometers inside Pakistan at Landi Kotal. The pass cuts through the Safed Koh mountains which are a far southeastern extension of the Hindu Kush range.