Baetic System
The southern region of Andalusia, the most populous and second largest Autonomous Community in Spain, comprises eight provinces (Seville, Cádiz, Cordoba, Málaga, Granada, Almería, Jaén, and Huelva). Its northern boundary with other Spanish regions is defined by the Sierra Morena, and it has extensive coastlines on both the Atlantic and the Mediterranean. The geographic subregion of Upper (or Eastern) Andalusia lies mostly within the Baetic System, while Lower (or Western) Andalusia is centred on the Baetic Depression of the valley of the Guadalquivir.