Large villas dominated the rural economy of the Po Valley, Campania, and Sicily, and also operated in Gaul. Villas were centers of a variety of economic activity such as mining, pottery factories, or horse raising such as those found in northwestern Gaul. Villas specializing in the seagoing export of olive oil to Roman legions in Germany became a feature of the southern Iberian province of Hispania Baetica. Some luxurious villas have been excavated in North Africa in the provinces of Africa and Numidia.