Wikipedia
Memmert
Memmert is a small East Frisian island off the northern coast of Germany, with an area of . Memmert is uninhabited, with only one house on the island for wildlife-spotting purposes. Occasionally, some guests from the neighboring islands visit Memmert for recreation. Memmert is officially a wildlife protected area.
The island plays an important role in Erskine Childers's novel The Riddle of the Sands (1903).