REEFS are one of the most biologically diverse marine ecosystems on the Earth.Corals grow over geological time scales and have been in existence for about 200 million years.Corals reached their current level of DIVERSITY 50 million years ago.Coral reefs are present in the AREAS of Gulf of Kutch, Gulf of MANNAR, Andaman & Nicobar, LAKSHADWEEP Islands and Malvan.