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1-476: A sand island is an island made up of sand. Sand Island is the name of several places including: Sand island A sand island is an island that is mostly made of sand . The largest sand island in the world is K'gari , Australia. Other examples of large sand islands are Moreton , North Stradbroke and Bribie Islands which lie south of K'gari(Fraser Island) off the east coast of Brisbane, Australia . This article related to topography