le bord de mer -- seashore / seasidele bord de la mer -- the shore of the sea
To supplement Chris' great answer, here is a third example:
le bord de la mer Méditerranée / Baltique = the shore of the Mediterranean / Baltic sea
-> the definite article 'la' is included as it specifies which sea one is talking about
Also, see link here on a similar topic: the-definite-article-or-not
I hope this is helpful.
Bonne journée !
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