The Aquitanian language was the language of the ancient Aquitani, spoken on both sides of the western Pyrenees in ancient Aquitaine and in the areas south of the Pyrenees in the valleys of the Basque Country before the Roman conquest. It probably survived in Aquitania north of the Pyrenees until the Early Middle Ages.

The Garonne is a river that flows in southwest France and northern Spain. It flows from the central Spanish Pyrenees to the Gironde estuary at the French port of Bordeaux – a length of 529 km (329 mi), of which 47 km (29 mi) is in Spain ; the total length extends to 602 km (374 mi) if one includes the Gironde estuary between the river and the sea. Its basin area is 56,000 km2 (22,000 sq mi), which increases to 84,811 km2 (32,746 sq mi) if the Dordogne River, which flows from the east and joins the Garonne at Bec d'Ambès to form the Gironde estuary, is included.