Not all coral reefs emerge from naturally occurring objects on the sea bottom.
12 Outstanding Artificial Reefs to Visit
14 Best Caribbean Coral Reefs to Explore
Virgin Islands to Welcome First Artificial Reef Near St. Thomas This Summer
Diving Artificial Reefs
The world's most spectacular artificial reefs
The Best Way To Experience Australia's Great Barrier Reef
The Great Barrier Reef: a catastrophe laid bare, Great Barrier Reef
Red Sea Coral Reefs Keep Thriving Despite Global Warming - The New York Times
The Bight Reef (Coral Gardens), Providenciales
Artificial coral reefs showing early signs they can mimic real reefs killed by climate change, says study