Ключевые слова: aerial, aerial view, aleksandar stamboliyski, aleksandar stamboliyski reservoir, aleksander stamboliyski, alexandar stamboliyski, balkan, balkans, bulgaria, cascade, dam, danube plain, drone, engineering, environment, europe, forest, gabrovo region, hydro, hydroelectricity, lake, landmark, landscape, meadow, mountain, natural, nature, panorama, peninsula, reservoir, river, rositsa, rositsa river, scenics, sight, sightseeing, stara planina, stara planina mountain, summer, terrain, tourism, travel, veliko tarnovo region, view, water, wilderness,