Actually, there are some site locations written into the map file as part of the terrain code: Those are rumored sites (or however you like to put it), which show as special icons on the map. Check out the ICONS on the MAP??? - Thread.
Mind though, that those are not sites, but only guaranteed locations to find some random site from certain path.
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As for AI the most effective work around to this problem so far is to simply use an American instead, they tend to put up a bit more of a fight than your average Artificial Idiot. ... James McGuigan on rec.games.computer.stars somewhen back in 1998 ...