With the exception of Wangeroog, which belongs to the grand duchy of Oldenburg, the East Frisian Islands belong to Prussia.
BORKUM, an island of Germany, in the North Sea, belonging to the Prussian province of Hanover, the westernmost of the East Frisian chain, lying between the east and west arms of the estuary of the Ems, and opposite to the Dollart.
The East Frisian districts, Oostergoo and Westergoo, were by Lothaire transferred from the rule of the bishops of Utrecht to that of the counts of Holland (1125).
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