- historical region of SW France: orig., a division of Gaul; later, a duchy under the French crown, passed to English control when Eleanor of Aquitaine married Henry II; returned to France after Hundred Years' War
- metropolitan region of modern France of much smaller size: 15,949 sq mi (41,308 sq km); chief city, BordeauxLatin name Aq·ui·ta′nia
A Roman division of southwest Gaul extending from the Pyrenees to the Garonne River and roughly coextensive with the historical region of Aquitaine. Its Iberian peoples were conquered by Julius Caesar in 56 BC. The region passed to the Franks in AD 507.