Ключевые слова: aerial, aerial view, balkan, balkans, bulgaria, cascade, dam, drone, engineering, environment, europe, fishing, forest, hill, hydro, hydroelectricity, lake, landmark, landscape, meadow, montana, montana region, mountain, natural, nature, ogosta, ogosta reservoir, panorama, peninsula, power, relax, reservoir, resource, river, scenery, scenics, sight, sightseeing, stara planina, stara planina mountains, summer, terrain, tourism, travel, tree, valley, view, water, wilderness,