Ключевые слова: background, beautiful, bojana, boyana, branch, bulgaria, bulgarian, cascade, clean, cliff, environment, fall, flow, forest, fresh, grass, green, hike, landmark, landscape, motion, mountain, national, natural, nature, outdoor, outdoors, park, river, rock, scenery, scenic, sofia, speed, splash, splashing, stone, stream, track, travel, tree, vitosha, water, waterfall, wet, wild, wood,