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In page Coral Sea Islands:

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There are about 30 separate reefs and atolls, twelve being wholly submerged or drying only during low tide, and 18 others with a total of about 51 islets and cays (18 alone on the atoll Lihou Reef), some of which are vegetated. The atolls exhibit a wide range of size, from a few kilometres in diameter to perhaps the second largest atoll in the world by total area (including lagoon): Lihou Reef, with a lagoon size of 100 by 30 kilometres (62 by 19 miles) and an area of 2,500 square kilometres (970 square miles), which compares to a combined land area of the 18 individual islets of only 0.91 square kilometres (0.35 square miles).[citation needed] The islands are all very low.