Balneario de Nanclares de la Oca Historical milestone · Iruña Oka/Iruña de Oca, Cuadrilla de Añana, Álava Image of Iruña Oka/Iruña de Oca, not of the place itself. The spring at Nanclares de la Oca gave rise in the 19th century to a spa that became an important center of leisure and recreation for the bourgeois society of the time. Photo: Basotxerri (CC BY-SA 4.0) What to see and do in Iruña Oka/Iruña de Oca