NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Al Wadj Bank, Red Sea, Saudi Arabia, from space. This is a coral reef system that includes islands (brown), seagrass meadows (dark green) and sand plains (beige). Lighter blue water is shallower and darker blue water is deeper. Photograph taken from the International Space Station (ISS) on 30th December 2007.
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