tu_79
Deity
Fort on coast gives access to naval units, but might not be build next to another fort. A Citadel gives access to naval units too, but cant be build next to another citadel. (I think the ingame text said so, even if the wiki dont say sth about it.)
My question, is it possible to build a citadel next to a fort? If yes, can create a "canal" between lakes/oceans two tiles apart from another? Or could it be even possible to build a longer chain of fort, citadel, fort, .... to create a Canal for a longer distance?
This has been answered before, I think you need a city in between for this to work. Fort, citadel, city, fort, citadel.