User blog:IRMacGuyver/30/31 closed wells in Assassin's Creed Revelations.

http://static1.wikia.nocookie.net/__cb20111220225341/assassinscreed/images/2/25/Acr-revelation-map-constantinople-galata.jpg

This map has 30/31 well locations

This old blog insisted there were only 27

http://assassinscreed.wikia.com/wiki/User_blog:Burk89/Hidden_31_wells_in_revelations

Where is the last missing well location?