Well a suggestion for a map would be sixlands.
http://forum.shrapnelgames.com/showthread.php?t=36830
I just checked two other 6 player games and they seemed to use that map but there are no water provinces. I could dig a bit further to find a prettier map.(there is one I saw called the blessed Island but its with only 75(12.5) for 6 players and only 11 water provinces so basically) what is usually player is 15 provinces per person so we need to find a map with 90+ provinces.
Edit: for four players we could use this one
http://forum.shrapnelgames.com/showthread.php?t=4437
or this one is really pretty but its small 12.5 provinces a player
http://forum.shrapnelgames.com/showthread.php?t=31184
and here is a map list link if you want to look for anything else that might interest you:
http://forum.shrapnelgames.com/showthread.php?t=34207