Mountain range of Alcubierre Nature · Alcubierre, Los Monegros, Huesca The Sierra de Alcubierre stretches 40 km along the boundary of Zaragoza and Huesca, from the Llanos de la Violada to La Almolda, forming the most prominent relief of Los Monegros and the watershed between the Gállego and Flumen basins; it is protected as a Site of Community Importance and a Special Protection Area for Birds. Its highest points are the hermitage of San Caprasio, at 834 metres, and Monte Oscuro, at 824. It was once covered by dense forests of Spanish juniper (sabina), holm oak (carrasca) and common juniper (enebro), from which, according to tradition, the name Monegros would derive, meaning "black mountains"; today it is largely replanted with Aleppo pine, and a two-thousand-year-old specimen still survives nearby, the Sabina de Villamayor. It was also the scene of intense fighting during the Civil War, on the so-called Alcubierre Front. Photo: Zaka (Public domain) What to see and do in Alcubierre