Ordesa y Monte Perdido National Park is an IUCN Category II National Park situated in the Pyrenees. 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 square kilometres. 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 because of its spectacular geologic landforms.