Ключевые слова: aleko, amazing, balkans, biosphere, bulgaria, drone, environment, europe, forest, grass, hill, kamen del, kamen del peak, lake, landmark, landscape, meadow, mountain, mountaineering, natural, nature, outdoors, panorama, park, peak, recreation, reserve, river, scenics, seasons, sight, sightseeing, small, snow, sofia, sofia city region, stone, stone river, summer, tourism, travel, tree, trees, view, vitosha, vitosha mountain, wilderness, wood,