New Castile is bounded on the S. by La Mancha, on the W. by Estramadura, and on the E. by Aragon and Valencia. It has an area of 20,178 square miles, and is divided into four provinces, Madrid, Toledo, Guadalajara, and Cuenca. Occupying a table-land that stretches from the Sierra Guadarama to the Sierra Morena, it has much the same climate as the northern province, but the heat in summer is more intense, and the broken nature of the ground towards the S. offers greater varieties of soil and temperature. Grain, oil, and wine, are produced abundantly, the Val-de-Penas vineyards being most highly esteemed. Saffron, madder, hemp, and fruit are successfully cultivated. The Sierra Morena is rich in marble and minerals, and the silver mines of Almaden have been celebrated for centuries. Cattle and horses are raised in great numbers, and merino wool is a valuable export. Manufacturing industries are at a low ebb. The chief rivers are the Tagus, Guadiana, Guadalquivir, Segura and Jucar, but water is everywhere scarce.
Castile was erected into a kingdom in the eleventh century under Sancho the Great of Navarre, who gave it to his son Ferdinand I. This latter added by conquest Leon, Asturias, and Galicia to his domains, and New Castile was also acquired. Ferdinand III. (1230) drove the Moors out of Estramadura and Andalusia, but the fortunes of the monarchy were variable until Isabella, sister and successor of Henry IV., married Ferdinand of Aragon (1474). Granada was soon afterwards annexed, the Moorish domination came to an end, and the kingdom of Castile merged into that of Spain.