Correction for the size of The Great Barrier Reef
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How big is 171,785,430 hectares?
It's about five times as big as The Great Barrier Reef
The size of The Great Barrier Reef is about 34,800,000 hectares.
(a.k.a. Barrier Reef) (Coral Sea, off Queensland, Australia) (approximate)
The Great Barrier Reef, the largest such reef in the world, covers about 34,800,000 hectares. Reefs, such as the Great Barrier, grow in diameter at a rate of 1 to 3 cm per year.