Fertile Plains by large rivers
The Rio Guadalquivir lies just to the south of the Sierra Morena. This is Andalucía's longest river, flowing throughout the region - westward from Jaén province through Córdoba, then south through Seville before it enters the Atlantic at Sanlúcar de Barrameda. The valley of the Guadalquivir is the most fertile area in Andalucia, broadening out from east to west. From its lower end, a broad plain stretches west across Huelva province and southeast into Cádiz province. Near its mouth, the Guadalquivir splits into a marshy delta known as Las Marismas del Guadalquivir which includes the Parque Nacional de Doñana.
The Guadalquivir used to be navigable from the Atlantic as far upstream as Córdoba, and is still navigable up to Seville, and its valley has always been the great artery of Andalucía. The plains rolling north and south from the river as far down as Seville are known as La Campiña. From around Córdoba downstream, the valley is referred to as the lower Guadalquivir basin.
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