respomuso reservoir formerly a natural mountain lake, or ibón, aragón, pyrenees range

alpine aragonese aragasup3 balaitus basin biodiversity biome cirque dam dams degradation directive drought dry ecoregion ecosystem european fauna freshwater glacial glaciation gaiexcl llego habitat habitats high huesca hydrography hydropower ibon ibones lake landscape logging montane mountain peak piedrafita pristine pyrenean pyrenees range reservoir resorts respomuso river sallent spain stream thousand threat three waterfall watershed winter