Ключевые слова: balkans, biosphere, branch, bulgaria, cherni vrah, cloud, colors, environment, europe, forest, grass, green, hill, landmark, landscape, leaf, meadow, morning, mountain, mountaineering, mystery, natural, nature, outdoors, panorama, park, peak, peninsula, plant, recreation, reserve, road, scenery, scenics, seasons, sky, sofia, sofia city region, tourism, travel, tree, view, vitosha, vitosha mountain, wilderness, wood, woodland, yellow,