Coral Reefs are scattered all around the world. Here on this map shows all the locations.
Reef Destruction
Reef destruction varries between climate change and human distrubances in climates. Various human activities (such as runoff from farming) and natural activities (such as flooding) affect water quality on the reef. Extensive land development in the catchments areas around the Great Barrier Reef has led to increasing pollution of the reef water.
(Reference 3)
defenders.org