Karrantza Harana / Valle de Carranza

Karrantza Harana / Valle de Carranza stretches across the westernmost tip of Bizkaia, within the Enkarterri region, bordering Cantabria and Castile and León. It is the largest municipality in Bizkaia by area, with a territory made up of nearly fifty scattered villages set among mountains, Atlantic woodland and meadows, and a way of life historically shaped by livestock farming.

The natural landscape revolves around the Armañón Natural Park, a protected area that includes, among other assets, the Pozalagua cave —noted for its exceptional concentration of eccentric stalactites— and the Karpin Fauna environmental education centre. Together they offer a compelling setting for walking and discovering the valley's natural environment.

The valley's cultural heritage is reflected in its rural architecture and in standout features such as the 16th-century Renaissance murals of the church of San Andrés de Biáñez, considered the most significant of their kind on the Cantabrian coast. Set away from the busier tourist routes of Euskadi-Basque Country, Karrantza has a quiet atmosphere and a well-preserved rural identity that sets it apart within the Enkarterri valleys.