Ключевые слова: aerial, aerial view, balkans, bulgaria, bulgarian, cascade, countryside, dam, drone, ecology, environment, europe, fall, fishing, forest, hiking, hill, iskar, iskar dam, iskar reservoir, iskar river, landmark, landscape, location, lozenska, mountain, nature, outdoor, panorama, plana, reservoir, river, scenic, sight, sightseeing, sky, sofia, sofia city region, terrain, tourism, trail, travel, vacation, view, vitosha, water,