Coral reef to form fringing reefs, and can eventually grow become a barrier reef. Where the bottom is rising, fringing reefs can grow around the coast, but coral raised above sea level dies. If the land subsides slowly, the fringing reefs keep pace by growing upwards on a base of older, dead coral, forming a barrier reef enclosing a lagoon between the reef and the land. A barrier reef can encircle an island, and once the island sinks below sea level a roughly circular atoll of growing coral continues to keep up with the sea level, forming a central lagoon. Barrier reefs
Coringa-Herald National Nature Reserve Coringa-Herald National Nature Reserve Coringa-Herald National Nature Reserve is a former nature reserve in Australia’s Coral Sea Islands Territory that was incorporated into the new Coral Sea Commonwealth Marine Reserve in December 2012. The former nature reserve together with the Lihou Reef National Nature Reserve is part of the Coral Sea Reserves Ramsar Site. Its extent is also within the Coringa-Herald Reefs Important Bird Area. The reserve lies to the east of the Great Barrier Reef and covers an area of 8,860 km, most of which is open water. It contains three pairs of islets and cays, the Herald Cays,