An Image Map Shader masks the large scale Power Fractal terrain to carve out the pass. A couple of Redirect Shaders (both on X and Z) at different feature scales give the cliffs bulge and bump. I utilised the Soft Shadows option to soften the shadow edges of the right-side cliffs falling on the left-side cliffs. It added 40% to the render time, but was worth it.
ps. I don't know if there is a pass at Arabah, which is near Petra, but why not.
John
Looks good John!
I really like the small cloud on top of the right-side cliff.
Terrain and texturing are fine. Maybe you could add some bigger bulges/bumps on the left side cliff?
The soft-shadows were certainly worth the extra render-time :)
Martin
Very nice, indeed. What's around on to the other side?
Nice land forms. I especially like the way the clouds are drifting over them at the right side.