I just came across Rukha Sikhara Summit after following a red flash on a mountain, it was a cool place to find because I had to climb the mountain all the way up...without much help of the hook. There is also a mask up there in Kalosa Ashram.

I guess the exploration parts without maps are better and funnier in this version of far cry : )


Some screenshots:
http://imgur.com/a/EwSK3#0