This has probably been done before, but here’s a consolidated map of Gotham City as depicted in the Arkham series.
(WordPress used to automatically make a link to a bigger version, but now it doesn’t, so click that link to get there.)
Weirdly, Arkham Knight (which we have to assume is Rocksteady’s last word on the subject) tilts the Arkham City portion of the map by 45°. If you don’t believe me, check the in-game map! You can identify the courthouse, the Peabody Institute, Wonder Tower, and the steel mill, and clearly see that the street grid is tilted relative to Miagani Island.
Arkham Origins gives the location of Wayne Manor and Blackgate. The Origins portion of the map may be oversized here.
Seagate is from the Matter of Family DLC for Knight; its location relative to the city is not given.
The inset (bottom left) gives the Arkham City map; it has a little peninsula that doesn’t appear in Origins, and also makes downtown Gotham much closer than in Knight.
As a bonus, here’s a comparison of the same view in Arkham City and Arkham Origins.
Not everything matches up, but a lot does. What you chiefly notice, I think, is that even with the snow effects, City was much clearer. Origins has way too much fog.