Somewhere in the Sultanate of Muscat and Oman? Salalah?
BTW, I would have said that the aircraft in front is an F27, not a Convair 640 (as in the pic's title). The Twotter in the background is probably a clue to those who can interpret it. I don't think the F27 is one of Gulf Air's, though, although the tailfin looks a bit like that. It's an Arab-type colour scheme, though.