The Garonne 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 529 km, of which 47 km is in Spain; the total length extends to 602 km if one includes the Gironde estuary between the river and the sea. Its basin area is 56,000 km², which increases to 84,811 km² if the Dordogne River, which flows from the east and joins the Garonne at Bec d'Ambès to form the Gironde estuary, is included.
Umayyad and Aquitanian forces fought the Battle of the River Garonne in 732 beside the river near present-day Bordeaux.