Learn French: Il n'y a pas de plages à Paris. - There are no beaches in Paris.

In French, you always use the preposition à for cities to say "in" or "to" a place. The prepositions en, au, and aux are reserved for countries and regions. Since Paris is a city, it is always à Paris.

How does the negative work in il n'y a pas?

The basic phrase for "there is" or "there are" is il y a. To make it negative, the ne (which shortens to n' before a vowel sound) goes right before the y, and the pas goes after the a. So "there are no" or "there aren't any" always becomes il n'y a pas.

Why is it pas de plages instead of pas des plages, since beaches are plural?

This is a very common trap! In French, when a sentence becomes negative, plural and indefinite articles like un, une, or des change to a simple de (or d'). Even though plages is plural, "not any beaches" must be pas de plages.

Do I pronounce the "s" at the end of plages?

No, the "s" at the end of plages is completely silent. When spoken, it sounds exactly like the singular word plage. You only know it is plural because of the context and the spelling.