Correction for the size of The Great Barrier Reef
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How big is 170,303,600 dunams?
It's about half as big as The Great Barrier Reef
The size of The Great Barrier Reef is about 348,000,000 dunams.
(a.k.a. Barrier Reef) (Coral Sea, off Queensland, Australia) (approximate)
The Great Barrier Reef, the largest such reef in the world, covers about 348,000,000 dunams. Reefs, such as the Great Barrier, grow in diameter at a rate of 1 to 3 cm per year.