añisclo canyon, a karstic landscape in the ordesa and monte perdido national park, pyrenees

2000 and aragonese aragón area añisclo beech biodiversity biome biosphere canyon cliffs degradation directive distance ecoregion ecosystem ecosystems effectiveness european forest forests growth habitat habitats hiking huesca karst karstic landforms limestone logging long management massif mediterranean mixed montane monte mountain mountains national natura network oak old ordesa park perdido pirenaica protected pyrenean pyrenees range reserve senda spain trail viñamala