German Bight
The German Bight and the area around the island are known to have been inhabited since prehistoric times. Flint tools have been recovered from the bottom of the sea surrounding Heligoland. On the "Oberland", prehistoric burial mounds were visible until the late 19th century, and excavations showed skeletons and artifacts. Moreover, prehistoric copper plates have been found under water near the island; those plates were almost certainly made on the "Oberland".