Ключевые слова: activity, adventure, alvo, arch, arnal, backpacker, bridge, brook, cascade, countryside, creek, douro, duero, environment, europe, flowing, forest, galegos, hiking, hill, landscape, moss, mountain, natural, nature, outdoor, park, pedestre, percurso, plant, portalegre, portugal, recreation, ribeira, river, rock, route, stone, stream, travel, valley, walk, walking, water, waterfall,