Ordesa y Monte Perdido National Park is an IUCN Category II National Park situated in the Pyrenees of Huesca province, Aragon, Spain. There has been a National Park in the Ordesa Valley since 1918. Its protected area was enlarged in 1982 to cover the whole region amounting to 156.08 km². It has been included since 1997 by UNESCO in the Biosphere Reserve of Ordesa-Viñamala. In the same year it was included in the cross-border Pyrénées - Mont Perdu World Heritage Site.