How do you add harbors in a new created map?

[DavM 10]

Basically the question of the title. I can't find a way to add harbors with the available options in the ingame editor.

[DavM 10]

Again, I have found the answer by myself. When you create a map, the first thing you should do is edit the sea provinces. Only then you can edit the connections. All land provinces that have a connection with a sea province will end up with a zero code in the sea province editor. A province with a 0 will be able to house a port on it. In my experience, when you make maps in the scenario editor, default harbors will seem to appear in the most populated coastal province of a civilization.