The following table contains basic information about the islands and sand flats. The uninhabited and unparished sand flats are highlighted in yellow. Norderney is the remaining part of Buise, which was almost entirely engulfed by the sea in the 17th century. Lütje Hörn east of Borkum is in constant danger of being washed away. In 2003 the German Coastal Defence announced that the sandbank Kachelotplate can now be called an island too, because it is no longer regularly flooded by high tide. However, it is not larger than 2 km² and will remain unsettled. Kachelotplate is located north of the mouth of the Ems river. Most of the islands do not allow cars. The exceptions are Borkum and Norderney, which are also the most crowded islands. There are no bridges connecting the mainland with the islands. Each island is accessible by ferry. Borkum and Norderney, the Nazilabour camps on Alderney, were named after the islands. The islands and the surrounding sea are part of the Lower SaxonyWadden Sea National Park.
Effects of storms and currents
Even though today they are established islands, some of them continue to be in motion. On the East Frisian island of Juist for example, since the year 1650 there are five different proven sites for the church, as the spot for rebuilding the church had to keep pace with the ever-moving island. At times, Juist even consisted of two islands, which eventually grew back together. The neighbouring island of Wangerooge in the last 300 years has moved a distance equivalent to its own length to the east, its church tower, destroyed at the outbreak of World War I apparently moving from east to west. In this process, land is slowly eroded on the western coasts, while sediments are deposited on the eastern coasts. As a result, western coasts are increasingly protected by human action. The canals between the islands serve as passages for the tides, so that in these places the scouring action of current prevents the islands gradually joining one to another.
In popular culture
A German invasion fleet masses in the Frisian Islands in the pre-World War I invasion thriller Riddle of the Sands. German students memorize the names of the seven inhabited islands by using a mnemonic device: Welcher Seemann liegt bei Nanni im Bett? At a first glance, the question for Nanni's company for the night does not seem to make a lot of sense. In the German original, however, the very first letter of every individual word represents the first letter of the name of the island geographically occupying the same position in the chain of islands that the respective word occupies within the chain of words, i.e. the sentence. The device: Welcher — Seemann — liegt — bei — Nanni — im — Bett? In English: Which — seaman — lies — by — Nanni — in — bed? Representing Wangerooge, Spiekeroog, Langeoog, Baltrum, Norderney, Juist '*' and Borkum, in order. '*' The old German alphabet at the time of the creation of the mnemonic did not yet differ between "i" and "j"