Assertion: archipelago's island | /r/HasProperty | populated triangular 1 km2
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Source sentences:
text: Heligoland is located 46 kilometres (29 mi) off the German coastline and consists of two islands: the populated triangular 1 km2 (0.4 sq mi) main island (Hauptinsel) to the west, and the Düne ("dune", Heligolandic: de Halem) to the east.