Ключевые слова: allegheny mountains, autumn, background, beautiful, blue, cloud, colorful, dark, ecology, environment, evening, field, flood, fog, foliage, forest, grass, green, hill, holiday, lake, landscape, leaf, light, mountain, natural, nature, outdoor, outdoors, park, reflection, river, scenery, scenic, season, serene, sky, spring, stream, summer, sun, tourism, trail, travel, tree, vacation, view, water, winter, wood,