 Within that uniformity, the most outstanding variation in altitude is that of the Montes de Toledo, with peaks such as La Villuerca (), the highest peak of the Montes de Toledo range, and Rocigalgo ().At the south of that system are the Montes de Toledo, which cross the region from west to east, dividing the Tagus ("Tajo") and Guadiana drainage basins, forming the southern slope of the basin of the former and the northern slope of the latter.In contrast, a more mountainous zone surrounds the Meseta and serves as the region's natural border.