User blog comment:Buginmyeye/Dunwall City Map/@comment-86.14.69.172-20130508161423

There is also this map of southern Gristol with Dunwall marked on it, you can see the Wrenhaven's mouth.

http://images2.wikia.nocookie.net/__cb20121023142215/dishonoredvideogame/images/d/d9/Gristol_map.png