Posets-Maladeta Massif Nature · Gistaín, Sobrarbe, Huesca The Posets-Maladeta massif, on the eastern edge of Sobrarbe, contains the highest peaks of the Aragonese Pyrenees and has been protected as a natural park since 1994, covering 33,440 hectares spread across the municipal areas of Benasque, Gistaín, Montanuy, Sahún and San Juan de Plan. It is home to the Aneto, at 3,404 metres the highest peak in the Pyrenees, along with other peaks over 3,000 metres such as the Posets and the Pico Maldito, as well as moraines and glacial lakes (ibones) such as those of Vallibierna and Cregüeña. Vegetation is arranged in bands with altitude, from rowans and birches to beeches, pines and firs, giving way at the highest elevations to mountain pine; its fauna includes marmots, chamois, griffon vultures, bearded vultures and golden eagles. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Gistaín