Ключевые слова: adventure, alpine, alps, autumn, background, beautiful, canyon, cloud, clouds, environment, europe, formation, geology, gorge, grass, green, high, highland, hiking, hill, landscape, lucerne, meadow, mountain, mountains, natural, nature, outdoor, panorama, peak, pilatus, range, ridge, rock, scene, scenery, scenic, sky, stone, summer, switzerland, tourism, travel, trekking, vacation, valley, view, walking, wilderness,