This is the 7185th most frequent French word.
mostaganem
"Mostaganem" is a proper noun referring to a coastal city in Algeria.
In this sentence, 'Mostaganem' is used as a proper noun referring to a specific place: the city named Mostaganem.
Mostaganem est une ville côtière située en Algérie.
Mostaganem is a coastal city located in Algeria.
Here, 'Mostaganem' signifies the destination of the speaker's vacation, again used as a proper noun.
J'ai passé mes vacances à Mostaganem l'été dernier.
I spent my vacation in Mostaganem last summer.
In this example, 'Mostaganem' identifies the location associated with the subject of the sentence, the beaches, used as a proper noun.