From the Wikipedia page 
Spiekeroog is one of the East Frisian Islands, off the North Sea coast of Germany. It is situated between Langeoog to its west, and Wangerooge to its east. The island belongs to the district of Wittmund, in Lower Saxony in Germany. The only village on the island is also called Spiekeroog.The island is part of the Wadden Sea World Heritage Site by the UNESCO and the Wittbülten National Park.