Ключевые слова: aerial, aerial view, balkans, bulgaria, canyon, dam, drone, dyakovo, dyakovo reservoir, engineering, environment, europe, forest, geological, hill, hydro, hydroelectricity, kyustendil, kyustendil region, landmark, landscape, meander, mountain, natural, nature, panorama, power, reservoir, resource, rila, rila mountain, river, road, scenics, sight, sightseeing, terrain, tourism, travel, tree, verila, verila mountain, view, water, wilderness,