Ключевые слова: aerial, aerial view, asenovgrad, balkans, bulgaria, cascade, chetiridesette izvora, dam, drone, engineering, environment, europe, forest, forty springs, geological, hill, hydro, hydroelectricity, landmark, landscape, leisure, meadow, meander, mountain, natural, nature, panorama, peninsula, plovdiv region, power, reservoir, rhodope, rhodopes, rodopi, scenery, scenics, sight, sightseeing, summer, the forty springs, the forty springs reservoir, thrace, tourism, travel, upper thracian plain, view, water, wilderness,