Coral reef islands and atolls. The reef face is the zone above the reef floor or the reef drop-off. This zone is often the reef's most diverse area. Coral and calcareous algae provide complex habitats and areas that offer protection, such as cracks and crevices. Invertebrates and epiphytic algae provide much of the food for other organisms. A common feature on this forereef zone is spur and groove formations that serve to transport sediment downslope. The reef flat is the sandy-bottomed flat, which can be behind the main reef, containing chunks of coral. This zone may border a lagoon and serve as
Coral Sea Reserves Ramsar Site commercial tour groups is regulated and limited, though there is some visitation by private yachts. Coral Sea Reserves Ramsar Site The Coral Sea Reserves Ramsar Site comprises the 17,292 km of oceanic island and reef habitats within the former Coringa-Herald National Nature Reserve and the former Lihou Reef National Nature Reserve in the Australian Coral Sea Islands Territory. The existence of the islands and cays within the two reserves has been known to navigators since the early nineteenth century. Lihou Reef was named after Captain John Lihou of HMS "Zenobia", who discovered the reef and its cays in 1823. The