mountainscapes in sierra tendeñera, aragonese pyrenees

and aragonese aragón area areas biodiversity biome biosphere degradation directive ecology ecoregion ecosystem ecosystems effectiveness european forest forests glacial habitat habitats huesca landscape landscapes limestone management massif montane monte mountain mountains mountainscape national ordesa otal park perdido pico pirenaica processes protected protection pyrenean pyrenees range reserve senda services sierra spain tendeñera trail viñamala