Eighteen percent of Andalucia is protected land, the main classifications of which are National and Nature Parks. Fifty percent of Andalucia is mountainous and one third is above an altitude of 600 metres, including some extensive plateaus, and 46 peaks reach more than 1,00 metres. The Sierra Nevada mountain range (5) has two peaks, Mulhacen and Valeta, which are higher than 3,400 metres.
The Guadalquivir River, one of the longest in Spain, runs between two mountainous areas, the Sierra Morena mountains (which contain the Natural Parks 15, 16 and 17) to the north and the Betica ranges to the south. The river, whose source is in the Sierra de Cazorla Natural Park(10) in Jean Province in the east and estuary in the western marshlands on the Atlantic coast of the Donana National Park (18), has created a fertile valley running through Andalucia´s territory.