It's been pointed out that this thread doesn't mention hard-coded limit for campaign map size (apart from some initial speculation about 50pixel distance between cities)...
I think it is fairly well established (and it ties up with my research findings) that maximum possible size is 510 x 510 pixels map_regions.tga size which equates to 1021 x 1021 pixels map_heights.tga.
If anyone has got it to load over that please say....
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