Question: The island for which Ferdinand Avenarius is first popularizer belongs to which islands?

Context paragraphs:
Zhokhov Island: Zhokhov Island (Russian: Остров Жохова ; "Ostrov Zhokhova") is an island in the East Siberian Sea, situated 128 km north east of Novaya Sibir Island, the easternmost of the New Siberian Islands.  Zhokhov Island belongs to the De Long group.  It has an area of 77 km² .  The highest point of the island is 123 m .  This island belongs to the Sakha (Yakutia) Republic administrative division of Russia.

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.  It belongs to the North Frisian Islands and is the largest island in North Frisia.

Pecixe: Pecixe is an island or group of islands in the Bissagos Islands, Guinea-Bissau, it belongs to the Cacheu Region and the Caió sector.  The area is 168 km², its length is 20.6 km and its witch is 12.8 km.  Cassaca is the chief town.  The language of the island or islands is reported to be Mandjak (Portuguese: Manjago, also known as Manjaku), a language of Guinea-Bissau with over 72,000 speakers altogether.  Jeta, an island lies to the west.  It is an island closer to the mainland being 3 km near and separated by the Canal de Gebá, around the end of the Ice Age, it formed a part of the mainland.

Wetar: Wetar is a tropical island which belongs to the Indonesian province of Maluku and is the largest island of the Barat Daya Islands (literally "Southwest Islands").  It lies east of the Lesser Sunda Islands, which include nearby Alor and Timor, but it is politically part of the Maluku Islands.  To the south, across the Wetar Strait, lies the island of Timor; at its closest it is 50 km away.  To the west, across the Ombai Strait, lies the island of Alor.  To the southwest is the very small island of Liran, which is also part of Wetar district ("kecamatan") and, further southwest, the small East Timorese island of Atauro.  To the north is the Banda Sea and to the east lie Romang and Damar Islands, while to the southeast lie the other principal islands of the Barat Daya Islands.

Archipelago of San Bernardo: The Archipelago of San Bernardo (Spanish: "" ) is a set of nine coastal coral islands and one artificial island (ten in total) belonging to and governed by Colombia, located in the Gulf of Morrosquillo in the Caribbean Sea, with an approximate area of 213 km².  Administratively, the archipelago belongs to the Bolívar Department, with the exception of Boquerón Island, which belongs to the Sucre Department.  It consists of Boquerón Island, Cabruna Island, Ceycén Island, Mangle Island, Múcura Island, Palma Island, Panda Island, Santa Cruz del Islote (English: Santa Cruz Islet, an artificial island), Tintipán Island and Maravilla Island.

Sukomobanare Island: Sukomobanare Island (Japanese: 須子茂離島 ) is one of the islands of Amami Islands of Satsunan Islands, Japan, administratively belongs to Setouchi, Ōshima District, Kagoshima Prefecture.  It is about 6.4 kilometers from south of Eniyabanare Island, and about 5.6 kilometers southwest of Sukomo Village on western Kakeroma Island.  It is rectangular in shape with 2 kilometers long and 400 to 700 meters wide.

Sabalana Islands: The Sabalana Islands ("Kepulauan Sabalana") are an Atoll in the Flores Sea in Indonesia, lying just north of the Lesser Sunda Islands, closer to Sumbawa than Sulawesi.  They are west of Tanahjampea Island and north-east of the Tengah Islands (Central Islands).  Administratively, the atoll belongs to the province of South Sulawesi.  The total area, including the large lagoon, is 2694 km², making Sabalana one of the largest atolls by total area.  The land area of the largest individual island, Pulau Sabalana, measures about 7 km², followed by Pulau Banawaja with 3 km² and Pulau Sabaru with 1.4 km².

Havelock Island: Havelock Island (Hindi: हैवलॉक द्वीप) is the largest of the islands that comprise a chain of islands to the east of Great Andaman in the Andaman Islands.  It belongs to the South Andaman administrative district, part of the Indian union territory of Andaman and Nicobar Islands.  The island is 41 km northeast of the capital city, Port Blair.

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.

Igitkin Island: Igitkin Island (Aleut: "Igitxix̂" ) is a small island located in an area between Adak Island and Atka Island among other small islands.  The island belongs to the Andreanof Islands of the Aleutian Islands of Alaska.

Supporting paragraphs: Ferdinand Avenarius Sylt
Answer: North Frisian Islands