Can't get to the north
I've been playing Far Cry 4 for a while but have got to the point where I'm not being offered any further missions and can't progress. For the whole of south Kyrat; I've found every location and lost letter, destroyed every propaganda poster and Mask of Yalung but can't progress any further.
Is there something I need to do to get to the north? I'm assuming I need the Key to the North mission to be offered to me?
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