Ключевые слова: aerial, aerial view, autumn, bulgaria, countryside, dam, drenov dol, drenov dol reservoir, drone, ecology, environment, fall, fish, fishing, forest, green, kyustendil, kyustendil region, kyustendil valley, lake, land, landmark, landscape, lisets, lisets mountain, mountain, national park, natural, nature, osogovo, outdoors, pollution, region, reservoir, river, rural, scenic, sightseeing, tourism, travel, tree, view, village, water, wilderness, wildness,