Düne is one of two islands in the German North Sea Coast Area that belong to the Archipelago of Heligoland, the other being Heligoland proper.
The small island Düne is part of the German State Schleswig-Holstein. Situated 1 mile to the east of the main island Heligoland, Düne is part of the natural landscape Helgoländer Felssockel [Heligoland rock core]. The island measures 0.78 mile in length and 0.53 mile in width.
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