A karstic plateau between plains and valleys with dense forests and pastoral tradition
It is a high plateau that rises sharply between the Llanada Alavesa and the Arana valley and continues with the mountainous reliefs of the Sierra de Urbasa in Navarre, to the east, and with the Montes de Vitoria, to the west. The smooth and flat reliefs of the upper portion are interrupted by some small elevations and ravines that emerge from the ample forest canopy.
Equally important are the karstic phenomena that affect the large package of limestone and dolomitesof the upper portion, modeling a typical morphology with cracks, lapiaces, dolines, etc.