Having been a JG fan since the 1970's (subscription to the Wilderlands from back then...) I have a particular like for the area of the world right around the CSIO. Lots to do there, including Modron, Thunderhold, Tegel Manor, and so on.
I'd put it to the NE of the CSIO, perhaps near Warwick, and not too far from Thunderhold. Gives lots of good adventure material all together.
_________________Marv / FinarvynDCC Minister of Propaganda
; Deputized 6/8/11
DCC RPG playtester 2011, C&C
since 2003, ADRP
Since 1993, OD&D
player since 1975
"The worthy GM never purposely kills players' PCs, He presents opportunities for the rash and unthinking players to do that all on their own."
-- Gary Gygax
"Don't ask me what you need to hit. Just roll the die and I will let you know!"
-- Dave Arneson