[Chazar]

Is there a difference between a province being adjacent to sea province and a province that has the freshwater tag?

Or in other (and more) words: As far as I could deduce it from this forum, the freshwater tag merely affects whether a province can suffer from floodings and related things (Right?). So am I required to tag all coastal provinces as freshwater by hand or can I just mark all non-obvious (i.e. non-coastal) provinces with rivers as freshwater if I think that they are eligible to suffer from floodings and sirens?