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Your question is strange. You can completely rewrite the map from scratch, changing number, form and position of all provinces, be it land or sea.

It just takes a lot of time and is pretty complicated to do. ;)
 
It's not strange.
No, I meant the question whether it's possible to "change land into sea" was strange, as you can obviously create a whole new map, not just change an existing province into sea and an existing seazone into land... ;)
 
kinda had to rewrite this..forums messed up when i tried to post it :|

if you ever actually get around to working on the map expect it to take you a long while to actually finish if not make any progress. it took the mds2 guys months and all they did was add a few provinces, imagine how long it would take to create a whole new map of a planet!

not trying to discourage you though, a whole new world to play on would be pretty interesting, and im sure a lot of us would check it out and use it, including me. just expect it to be a quite a long term project if you only work on it to kill free time.

if you ever get around to starting the project and finishing it you can definitely expect me to be trying it out though.

heres something i think would be revelant to what your trying to do

http://forum.paradoxplaza.com/forum/showthread.php?t=341004 its a thread for a 'map editor' for hoi2 by james550 not sure of its features or anything, or what good it really is, but it might help you out a little if its AoD compatible which most likely it is seeing as how AoD is like 90 percent hoi2