Aneto (Pic de Néthou in French) is the highest mountain in the Pyrenees and in Aragon, and Spain's third-highest mountain, reaching a height of 3,404 metres (11,168 feet). It stands in the Spanish province of Huesca, the northernmost of the three Aragonese provinces, 6 kilometres (4 miles) south of the France–Spain border. It forms the southernmost part of the Maladeta massif. Its northern side holds the largest glacier in the Pyrenees, covering 79.6 hectares (196 3⁄4 acres) in 2005; it is shrinking rapidly due to warming summer temperatures and decreasing winter precipitations over the 20th century.

Aneto occupies the eastern end of the Malditos Massif which primarily consists of a 6 km (4 miles) long ridge, running from north-west to south east at over 3km (1.864 miles). The ridge connects Aneto towards the east with the more visible Maladeta peak, further to the west, and includes the Coronas peaks and Pico Maldito, which, together with the crest of the portillons, gives the massif its characteristic image.

More Info: en.m.wikipedia.org