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Whitsunday Island, largest of the Cumberland Islands, lying 6 miles (10 km) off the northeastern coast of Queensland, Australia, in the Coral Sea. An inshore, coral-fringed continental island, it measures 12 by 8 miles (19 by 13 km), has an area of 42 square miles (109 square km), and rises from steep cliffs of volcanic rock to Mount Whitsunday, 1,426 feet (435 metres). The island lies between the coral formations of the Great Barrier Reef...