Gironde estuary
or ) is a river of 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 , of which is in Spain (Val d'Aran); the total length extends to if one includes the Gironde estuary between the river and the sea. Its basin area is , which increases to if the Dordogne River, which flows from the east and joins the Garonne at Bec d'Ambès to form the Gironde estuary, is included.