Ключевые слова: amrum, background, beach, canyon, coast, desert, dunes, erosion, germany, grains of sand, island, kniepsand, landscape, maritime, national park, nature, north frisian islands, north sea, north sea coast, north sea island, pattern, sand, sand beach, sand dunes, sandbank, schleswig holstein, sea, structure, structures, texture, wadden sea, water, wind,