The Col of Despena-Perroz is nearly 2500 feet above the sea, and but few summits along the ranges of the Sierra Morena and its prolongations attain a greater elevation, the general range being about 2000 feet, except towards the west and north of Seville, where the Sierra de Aracena reaches 5550 feet. Eastward of the Guadalquiver the ranges which divide its waters from those of the Segura, the Sierras de Segura, and Sagra, attain a greater height, the former 6500 feet, the latter to 7800 feet. Thus as supports to the great plateau, or on it, we have the following successive ranges as we proceed from north to south. First, the Sierra de Moncayo and the Idubeda mountains, dividing the basin of the Ebro from that of the Douro; next the Guadarrama chain, with the Sierras de Credos and de Gata, separating the Douro from the Tagus; then the Mountains of Toledo, and the Sierra de San Mamed, between the Tagus and the Guadiana; and lastly, the southern buttress, the Sierra Morena, dividing the Guadiana from the Guadalquiver. But it is south of the last stream that the culminating points of the whole peninsula are to be found--in the mighty Sierra Nevada, which separates the lovely valley of Granada from the Mediterranean, shielding it from the scorching winds of Africa, and giving it its eternal freshness and verdure. The highest of its summits are Muley Hacen and Velate, lying to the south-east of Granada, the former attaining nearly 11,670 feet, and the latter 11,400. The altitudes diminish rapidly east and west. Towards the east, outlying ranges, such as those of the Sierras de Filabres and of Gador, attain heights of 6000 and 7000 feet respectively; while in the westward prolongations, the Mesa de Ronda is only 5000; and the chain gradually drops till it reaches the sea at Cape Trafalgar, and the rock of Gibraltar, 1400 feet.