Côte d'Argent (see list hotels) (in French for: the Silver Coast) is a touristic name given to a section of the French sea shore.All along the French coasts, the different parts of the sea shore have a particular name.In south west of France, facing the Atlantic Ocean, "La Côte d'Argent" is limited at its north by the Gironde mouth and at its south by the river Adour.

The Gironde is a navigable estuary, but often referred to as a river, in southwest France and is formed from the meeting of the rivers Dordogne and Garonne just below the centre of Bordeaux.

The Gironde is approximately 65 km (38 miles) long and 3–11 km (2–7 miles) wide and the French département Gironde is named after it. The Gironde is subject to very strong tidal currents and great care is needed when navigating the river by any size or type of boat.

The Adour (Basque: Aturri) is a river in southwestern France, rising in High-Bigorre (Pyrenees) and flowing into the Atlantic Ocean (Bay of Biscay) near Bayonne. It is 335 km long.