On Yuan Chwang's Travels in India, 629–645 A.D. v2.c23.s1.8

v2.c23.s1.8

The great mountain here described by the pilgrim with a Pass over it is called by him *P'o-lo-se-na*. This may be for Bālasena or Varasena (Julien), and Yule thinks it is "the Parsiana of Ptolemy". But it is perhaps better to regard it as the book-name in use among the Buddhists in the monasteries. The Pass here described is, according to St. Martin, the Khevāk (Khawak) Pass over the Hindu Kush at the head of the Panjshir valley,² the Khawak or Khawk of our maps.