Mention few other well-known reefs in the world.

The Belize Barrier Reef (Belize, Central America)
The New Caledonia Barrier Reef (New Caledonia, South Pacific)
The Andros, Bahamas Barrier Reef (Bahamas, Atlantic Ocean, southeast of United States)
The Red Sea Coral Reef (Red Sea)
Pulley Ridge (Southwestern Florida, United States)
Numerous reefs of Maldives (Indian Ocean)