Brief synthesisThe calcareous massif of the Pyrénées - Mont Perdu, located on the border between France and Spain, is composed of classical geological landforms, notably deeply-incised canyons on the southern Spanish side and spectacular cirque walls on the northern slopes within France. Criterion (iv): The high valleys and the calcareous summits of the Pyrénées – Mont Perdu are an outstanding example of a landscape shaped by a pastoral transhumance system that was developed in the Middle Ages and still exists today. Criterion (viii): The calcareous massif of Mont Perdu presents a series of classic geological landforms such as the deeply-incised canyons and spectacular cirques. The French State also invests in this type of action encouraging recognition of the Outstanding Universal Value of Pyrénées – Mont Perdu by the local populations. Although the survival of transhumance is dictated by international meat market prices and by grants originating from the common agricultural policy, the two States support and will continue to support the transhumant breeding sector in the Pyrénées – Mont Perdu site.