Ключевые слова: aerial, aerial view, balkan, balkans, bulgaria, cascade, dam, drone, elena, engineering, environment, europe, forest, green, hydro, hydroelectricity, iovkovtsi, iovkovtzi, island, lake, landmark, landscape, meadow, mountain, natural, nature, panorama, peninsula, reservoir, river, scenics, sight, sightseeing, stara planina, stara planina mountain, summer, tourism, travel, veliko tarnovo region, veselina, veselina river, view, water, wilderness, yovkovtsi, yovkovtsi reservoir, yovkovtzi,