From the Wikipedia page 
Vieux-Boucau-les-Bains, in Gascon language Lo Bocau Vielh, is a commune in the Landes department in Nouvelle-Aquitaine in southwestern France.
During the 1970s, an artificial lake and a touristic complex were created and named "Port d'Albret", this complex was built in the territory of Vieux-Boucau and the nearby town Soustons. During summer, the population is between 10,000 and 15,000 inhabitants.
There are three beaches along the Atlantic Ocean and one on the lake.