This outstanding mountain landscape, which spans the contemporary national borders of France and Spain, is centred around the peak of Mount Perdu, a calcareous massif that rises to 3,352 m. The site, with a total area of 30,639 ha, includes two of Europe's largest and deepest canyons on the Spanish side and three major cirque walls on the more abrupt northern slopes with France, classic presentations of these geological landforms. The site is also a pastoral landscape reflecting an agricultural way of life that was once widespread in the upland regions of Europe but now survives only in this part of the Pyrénées. Thus it provides exceptional insights into past European society through its landscape of villages, farms, fields, upland pastures and mountain roads.The calcareous massif of the Mount Perdu displays classic geological land forms, including deep canyons and spectacular cirque walls. It is also an outstanding scenic landscape with meadows, lakes, caves and forests on mountain slopes. In addition, the area is of high interest to science and conservation. Concerning cultural values, the Committee inscribed the property on the basis of criteria.The Pyrénées-Mont Perdu area between France and Spain is an outstanding cultural landscape which combines scenic beauty with a socio-economic structure that has its roots in the past and illustrates a mountain way of life that has become rare in Europe.