Henadic Theologian
Legend
Honest to Pete, just now looking for pictures online like, and reverse image searching the Free City of Greyhawk literally came up with maps of Waterdeep.
Anyways, for comparison, the 1980s official 1E AD&D TSR maps for Waterdeep, Greyhawk, and Lankhmar in no particular order:
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More modern map of Waterdeep interesting to compare the difference in all four maps.
The gap between main land waterdeep and the big island at the bottom is smaller then it used to be. The outside of Waterdeeps walls seem more developed as well.
Greyhawk is the only one on a river instead of the Ocean.
Lankhmar is clearly the inspiration for the other two, but there are still major differences.