After the Frisian and Danish colonisation of the islands in the 8th century, the Frisian-populated hundreds became the Uthlande. The North Frisians in the Uthlande were ruled directly by the Danish king and were known as Königsfriesen or "King's Frisians". Only later did the Uthlande transfer to the Duchy of Schleswig, with the exception of small Danish royal enclaves. Part of Rømø was also ruled by the Schleswig duke. After the German-Danish wars, the islands from Nordstrand to Rømø became Prussian in 1866. After the referendum in 1920, the current border between the islands of Sylt and Rømø was fixed. A good and thorough overview of the life, work, languages, costumes and customs of the island Frisians is portrayed by the Carl Haeberlin Frisian Museum in Wyk auf Föhr.
Islands
There are four larger islands and ten tiny islets. The names of the large islands are Sylt, Föhr, Amrum, and Pellworm. The islets are called Halligen. In medieval times the present-day peninsula Nordstrand and Pellworm as well as the Halligen were part of the large island of Strand. This island was torn to pieces in a disastrous storm tide in 1634. Sylt is the largest of the North Frisian Islands, consisting of about 100 km². It is accessible by a causeway called the Hindenburgdamm; this causeway is only accessible to trains. In the summer months the island is crowded with tourists, including those who have a preference for nudism. Sylt's image is that of a meeting point for the jet-set. The main town on the island is Westerland. The northern end of Sylt, the Ellenbogen, is Germany's northernmost point. Lager Sylt, the Nazi concentration camp on Alderney, was named after the island. Compared with Sylt, Föhr is a relatively silent island. Its area is 82 km². Sixteen old hamlets are scattered over the island, some of which already existed in the 13th century. The main town is Wyk on the south eastern shore. Wyk is a popular German seaside resort. There is no bridge or causeway connecting Föhr and the mainland, so ferries are the only connection. The ferry port, the harbour and Föhr marina are in Wyk. Amrum is only 20 km², but it is popular with tourists, though less crowded than Sylt. The western half of the island features a beach 12 km in length and 1 km in width. The villages are situated on the eastern shore, with Wittdün being the most important of them. Pellworm and the peninsula of Nordstrand are the remains of the submerged island of Strand. The main town of this sunken island was Rungholt, thought to be the largest town in the surrounding area, but it was totally destroyed and submerged by a storm in 1362, 272 years before another storm destroyed Strand itself. Nordstrand has an area of 49 km², Pellworm 37 km². Smaller remains of Strand are the ten islets called Halligen. The houses on these tiny islets are built on artificial hills. In a storm tide only these hills rise above the sea, while the remainder of the islet is flooded. The names of the Halligen are Nordmarsch-Langeness, Norderoog, Süderoog, Nordstrandischmoor, Oland, Südfall, Gröde-Appelland, Hooge, Habel and the Hamburger Hallig. West off the Halligen, three drying sand banks form the so-called North Frisian Barrier Islands: Japsand, Norderoogsand and Süderoogsand.
