They can back on a second source.
It's near Babylon, barely visible on the overview map in post 4.
(I do have a shot on HD when I opened the embassy, will dig it up)
edit: here it is.
hehe, dumb me, I didn't know wheel then, but marked the tile where the horse actually sits
http://www.civ3duelzone.com/forum/up...absembassy.jpg
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while looking back, quite impressive that the Babs got 6 wonders within ~60 turns!!