What is this grammatical concept called?
I've been having trouble knowing when to use du, de, de la, and des in certain expressions. For example:
>Je viens du Québec, c'est le symbole du Québec.
but...
>Le bateau a quitté le port de Québec.
I wanted to find an explanation in my grammar reference book (Essential French Grammar by Routledge) but I couldn't find what I was searching for under the articles section.
Edit: Thank you to all the helpful comments.