This promenade, named after the islands and streams generated by the river Arlanzón, it has a magnificent collection of nearly a hundred plant species, including elderberries, cypresses, redwoods and holm oaks among others. Along the way there are some beautiful monuments such as the arches of Castilfalé, in a Renaissance style; a fountain from the Monastery of San Pedro de Arlanza, a bust of Miguel de Cervantes and a beautiful fountain with a pond.