 To the west of Valdizarbe, Tierra Estella covers 38 different municipalities and extends along the Way of St. James in Western Navarre, on the middle reaches of the Ega River.The Ribera Alta sub-zone is centred on the town of Olite on the left bank of the river Ebro, above the lower reaches of the rivers Arga, Ega and Aragón, and covers 26 municipalities.This sub-zone covers 22 municipalities and is located in the northeast of the DOP, on the middle reaches of the river Aragón.