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 Marine Park encompasses the former Coral Sea Conservation Zone, former Coringa-Herald National Nature Reserve and former Lihou Reef National Nature Reserve. The Coral Sea Marine Park has been assigned IUCN protected area category IV. However, within the marine park there are multiple protection zones, each zone has an IUCN category and related rules for managing activities to ensure the protection of marine habitats and species. The following table is a summary of the zoning rules within the Coral Sea Marine Park: Coral Sea Marine Park The Coral Sea Marine Park (previously known as the Coral Sea Commonwealth Marine Reserve) is an Australian