The Aiako Harria (Peñas de Aya) Nature Park in the Basque Country is a granite massif nature reserve featuring many iconic mountain peaks. Starting from Irun, you’ll walk through Aiako Harria and then, for the most part, through Navarre near Lesaka, Arantza, Sunbilla, Zubieta and Goizueta. These places are also easily accessible by bike via the via verde.