Aneto is the highest mountain in the Pyrenees at 3,404 metres is part of the Maladetta ridge. The Aneto glacier is still the largest in Spain with 163 ha. though it is melting fast due to climate change and is predicted to succumb by the mid-late 21st century. The glacier covered some 692 ha in 1894 at the close of the so-called Little Ice Age. Aneto's French name, Pic de Néthou, is in disuse as the mountain lies entirely within Spain, specifically in the province of Huesca in Aragon. First climbed in 1842 by a Russian named Chikhachev.
Image of Aneto from the ibón (tarn) of Medio de Coronas from Wikipedia
A Biography of Spanish mountains