Brief synthesisThe property includes the two Prehistoric Rock Art Sites in the Côa Valley (Portugal) and Siega Verde (Spain), consisting of rocky cliffs carved by fluvial erosion and embedded in an isolated rural landscape in which hundreds of panels with thousands of animal figures (5,000 in Foz Côa, around 440 in Siega Verde) have been engraved over several millennia. The rock-art sites of Foz Côa and Siega Verde represent the most remarkable open-air ensemble of Palaeolithic art on the Iberian Peninsula within the same geographical region. Foz Côa and Siega Verde provide the best illustration of the iconographic themes and organization of Palaeolithic rock art, which adopted the same modes in caves and in the open air, thus contributing to a greater understanding of this artistic phenomenon. Criterion (iii): The rock art of Foz Côa and Siega Verde, when considered together, throws an exceptionally illuminating light on the social, economic, and spiritual life of our early ancestors. The ADECOCIR manager is responsible for the overall management and maintenance of Siega Verde, while security is provided by the Junta de Castilla y León, which is also responsible for the maintenance of equipment.