La Teste-de-Buch is a coastal commune in the Gironde department in the Nouvelle-Aquitaine region in Southwestern France. Until 13 June 1994, it was officially known simply as La Teste.
Gironde is the largest department in the southwestern French region of Nouvelle-Aquitaine. Named after the Gironde estuary, a major waterway, its prefecture is Bordeaux. In 2023, it had a population o