Sierra de Aizkorri-Aratz Natural Park Adventures

Sierra de Aizkorri-Aratz Natural Park, located in the province of Gipuzkoa within the Basque Country of northern Spain, encompasses one of the most impressive mountainous landscapes in the region. Established in 2006, the park covers the limestone mountain ranges of Aizkorri and Aratz, characterized by steep cliffs, karst formations, extensive caves, and high peaks such as Aitxuri at 1,551 meters — the highest point in the Basque Autonomous Community. The park's terrain is a mosaic of beech and oak forests at lower elevations, shrublands, and alpine meadows, providing diverse habitats for wildlife including wild boar, roe deer, foxes, and a variety of birds of prey like griffon vultures. The area also contains rare flora adapted to calcareous soils and cliffs.

Historically, the region has been used for traditional pastoralism and small-scale farming, and today visitors can explore ancient shepherd trails and small villages that dot the periphery of the park. Recreationally, Sierra de Aizkorri-Aratz is a hiking paradise featuring challenging summit routes, circuit trails such as the popular Aizkorri massif traverse, and access to spectacular viewpoints like the Urbia Plateau. Caving and mountain biking are popular secondary activities. The park is significant for its natural and cultural conservation within the Basque region, drawing outdoor enthusiasts year-round. Visitor appeal lies in its combination of rugged natural beauty, biodiversity, cultural heritage, and relatively undiscovered status compared to other Spanish mountain parks.