Flicking through the various web pages which feature tourism in the Languedoc I came upon one called JustTour France which is translated into English.

It contained this astounding piece of information about Marseillan Plage.
(It has a long, long sandy beach, but….)

Marseillan Plage:
Marseillan, between Agde & Sete,
34200 miles of fine sandy beaches for all the family