Heading some 80 km west up this valley one reached the Mintaka Pass , ( and 30 km farther , the alternative Kilik Pass ) , which both led into upper Hunza from where one could travel over the infamous rafiqs or `` hanging passages '' to Gilgit and on , either to Kashmir , or to the Gandharan plains . Heading some 80 k west up this valley one reached the Mintaka Pass , ( and 30 k further , the alternative Kilik Pass ) , which both led into upper Hunza from where one could travel over the infamous rafiqs or `` hanging passages '' to Gilgit and on , either to Kashmir , or to the Gandharan plains .