Ключевые слова: adventure, adventure tourism, aerial, balkan mountains, beauty, blue sky, bulgaria, calm, cold, countryside, exploration, forest, frost, frostcovered, frozen, highlands, hiking, hiking trail, hills, ice, landscape, mountain, nature, outdoor, panoramic, peaceful, remote, scenic, scenic view, seasonal, serene, snow, snowdrifts, snowy path, travel, trees, trekking, untouched nature, white, wilderness, wilderness trek, winter, winter hiking, winter sports, winter travel, winter wonderland,