|From Wikipedia: The North Frisian Islands are a group of islands in the Wadden Sea, a part of the North Sea, off the western coast of Schleswig-Holstein, Germany and Jutland, Denmark. The German-ruled islands are part of the Schleswig-Holstein Wadden Sea National Park and the Kreis (district) of Nordfriesland. The Danish-ruled islands belong to S°nderjyllands Amt. Occasionally Heligoland is also included in this group.|
There are five larger islands and ten tiny islets. The names of the large islands are Sylt, F÷hr, Amrum, Nordstrand and Pellworm. The islets are called Halligen. In medieval times the present-day islands Nordstrand, 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.