Reef

Crown of Thorns Reef, Galapagos Islands, sticking out of the water. From the U.S. Fish and Wildlife Service.

Useful links

• Google Street View of the Great Barrier Reef
• Good definition of reefs in a geologic rather than nautical sense
• Permian reefs in west Texas, USA
• Permian Reefs in Guadalupe Mountains National Park, Texas, USA Much of this park was donated to the country by Wallace Pratt, one of the founders of AAPG.
• Wikipedia article

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