This is copied from a comment of mine in another tread.Thought that maybe I might give my map it's own thread
http://imgur.com/gallery/DtkibWj/new
ok,so...i know that you are not suppose to use imugr just to store images but I can't bother to sign up somewere else.This is my idea of fallout4's map.
So,the big blue dot with yellow in the middle is the location of vault 111.(The location can be pinpointed in relation to Concord,since the red rocket station and the water tower are clearly visible from both areas)
The red one just below it is the location of Sanctuary Hills.(Accord to compass in gameplay trailer)
Below that,Concord is marked in yellow.Concord is the location where the sole survivor helps Preston Garvey.(It says "Clear concord from hostiles" in quest objective.
In Boston the red circle with the yellow cross is diamond city.(Fenway Park location)
The green circle on the other side of the river is the Institute.(MIT)
The fortified bunker hill monument is marked with a small red dot.
Finally the little yellow mark represents the Massachussets state House and the blue one beside it is Scollay Square.
The green arrow points in the very general direction of the ground zero.(Reveal trailer,in relation to the water tower)
EDIT1:North East of Boston there is a marshy area called Rumney Marshes,which might be in game.I seem to recall shots and artworks of marshy looking areas.