Keep in mind that I do not have a working ExMap at present.
Suppose I have a land region that is adjacent to multiple water regions. Here is an example:
[ATTACH]36265[/ATTACH]
The Walton, FL, region is adjacent to both Cerro Gordo Sound (called "Chowtawatchee Bay" in the picture) and further up the Choctawbatchee River. Is it possible to restrict guns in the stockade from firing on ships passing in the bay (and/or vice versa), but still have it fire on ships in the Choctawbatchee River?