With a little willingness, some of the terrain looks cultivated.
I tried to find some photos where terrain appears terraced natuarally, but will have to look further.
Until then this is what my eyes spies a place or two in the images:
Ofcourse without the water... (or who knows ;P)
or
On the 3rd image there's a spot that my eyes immediately interprit as a certain structur:
[edit on 8/11/07 by flice]
[edit on 8/11/07 by flice]