My Nikkor "trinity" (14-24, 24-70 & 70-200 VRII) handles all the landscapes my D800 throws at them with aplomb and would probably be the three I'd suggest.
Depends on ones budget and from a post Michael made a while back, the new Tamron 24-70 may be the current best out there in that focal range, but I'm only recommending what I own and use. If you needed something longer, the new Nikkor 80-400 VRII looks to be very good. With weight being an issue the 16-35 VRII and the 28-300 would buy one a lot of real estate in two smallish lenses. I have both and have found the former to be a very handy alternative to the 14-24 and while the latter is not a pro lens, I've had excellent results with mine for the times when one (or two) lenses is all I could take.
Unless you'd want to shoot ultra wide, I think you could do it in two - a 24-70 of some sort and the Nikkor 80-400. The 14-24 or the 16-35 would be my third recommendation. If you don't need a long lens, substitute the 70-200 VRII for the 80-400.
Except for my Sigma 50mm 1.4, Sigma 15mm Fisheye and my Nikkor 105 mm Macro, I don't use fixed focal lengths so if zooms aren't your cup of tea, or want something like Mike mentioned in his reply, the above lenses won't appeal.
Best wishes on the trip...it sounds fantastic!
Phil