Fraser Island is a heritage-listed island located along the southern coast of Queensland, Australia, approximately 200 kilometres (120 mi) north of Brisbane.It is a locality within the Fraser Coast Region.Its length is about 120 kilometres (75 mi) and its width is approximately 24 kilometres (15 mi). It was inscribed as a World Heritage site in 1992. The island is considered to be the largest sand island in the world at 1840 km 2.It is also Queensland's largest island, Australia's sixth largest island and the largest island on the East Coast of Australia.he island is considered to be the largest sand island in the world at 1840 km 2. It is also Queensland's largest island, Australia's sixth largest island and the largest island on the East Coast of Australia.