desfiladero de la horadada, spain

via verde santandermediterraneo desfiladero horadada montes obarenes san zadornil merindades burgos castile leon spain europe path walk trekk trekking route walking tour mountain ravine canyon gorge dedile valley river eroded riverbed geology geopark rock formation geomorphology landscape scenery nature wildlife environment ecosystem biosphere tourism ecotourism tranquil scene view natural park conservation area wildland recreation travel holidays