The island for which Ferdinand Avenarius is first popularizer belongs to which islands?
Ferdinand Avenarius: Ferdinand Avenarius (20 December 1856 in Berlin – 22 September 1923 in Kampen) was a German lyric poet, a leading representative of the culture reform movement of his time and the first popularizer of Sylt. Sylt: Sylt (] ; Danish: "Sild" ; Söl'ring North Frisian: "Söl") is an island in northern Germany, part of Nordfriesland district, Schleswig-Holstein, and well known for the distinctive shape of its shoreline.
i don't know