Not all coral reefs emerge from naturally occurring objects on the sea bottom.
14 Best Caribbean Coral Reefs to Explore
Great Barrier Reef, Cairns & the Tropical North
Australia's coastal towns are facing major erosion. Are artificial reefs a solution? - ABC News
The world's most spectacular artificial reefs
Saving Okinawa's Fragile Coral Reefs, VISIT OKINAWA JAPAN
Red Sea Coral Reefs Keep Thriving Despite Global Warming - The New York Times
Artificial Reef Locations In The Gulf Of Mexico Store
Plastic debris is smothering 92% of coral reefs examined in a new study : Goats and Soda : NPR
12 awesome artificial reefs - DIVE Magazine
Artificial Reef Deployment and Monitoring - Florida Sea Grant
The Great Barrier Reef is in very poor shape, suggests report
Best Diving in the Caribbean - Top 12 - Bluewater Dive Travel
Artificial Reef Locations In The Gulf Of Mexico Store
3D-printed artificial reefs to restore coral ecosystems
Where Are Coral Reefs Found? - WorldAtlas