These are the homes of approximate 2 million marine species including fishes, turtles, sea horses, lobsters, crabs, shrimps, algae, sharks, urchins, sponges, clams, octopuses, monk seals, and much more. Most of the reef itself is a submarine feature, rising from the abyssal floors of the ocean to just beneath high-tide level. Each species of hard coral differs somewhat in their ability to tolerate variations in these environmental factors, but each does best only within an even more narrowly defined set of “optimal” conditions – and shallow tropical seas are those parts of the oceans where “optimal conditions” for coral growth are most frequently found. The Caribbean region is where the second largest barrier, the Mesoamerican Barrier reef, is located. Coral Reefs are found in all tropical places they are mostly either found 150 feet or 450 feet deep. Coral reefs create specialized habitats that provide shelter, food, and breeding sites for numerous plants and animals. Most of the substantial coral reefs found today are between 5,000 and 10,000 years old, according to CORAL. Coral reefs generate throughout warm oceanbiomes (though not deep warm oceans), densely covering the sea floor. Coral reefs are made by colonies of tiny marine creatures and are held together by the calcium carbonate structures that are usually secreted by the corals.The stony corals consist of polyps that belong to animals known Cnidaria that also includes jellyfish and sea anemones. In this region the conditions are ideal for the abundance of marine biodiversity. The average surface water temperature in the summer is about 26 °C (79 °F) in the north and 30 °C (86 °F) in the south with a temperature variation of 2 °C (3.6 °F) during the winter. Even in the clearest of tropical seas, most photosynthesis only occurs in the relatively thin uppermost 100-200 ft. of the sea. Coral reefs are found all over the world, but majority of them re found in a wide belt in the middle third of the Earth that covers the ocean around the equator. They are most often found in warm, clear, shallow water where there's plenty of sunlight to nurture the algae that the coral rely on for food.Coral reefs cover less than 1 percent of the ocean floor — all the reefs combined would equal an area of about 110,000 square miles (285,000 square km), only about the size of the state of Nevada. Coral reefs in the Red Sea have developed high tolerance to variations on water temperatures. LOCATION. Located in the north of the Great Barrier Reef Marine Park, this 1100ha outer-shelf ribbon reef has benefited from its remoteness. Coral Reefs are known to be found in over 100 countries throughout the world. The largest coral reef is the Great Barrier Reef in Australia. Not all corals on the reef are stony corals. The water exchange between the Red Sea and the Indian ocean is minimum, allowing the development of unique characteristics which distinguishes this reef ecosystem from other reef ecosystems of the world. Coral reefs generate at constant elevation y level. Coral reefs are located in tropical oceans near the equator. The greater  variety of coral reef formations and biodiversity sets this region apart from other coral reefs in the world. Approximately 300 species of hard corals have been found in the Red Sea. The Northwestern Hawaiian Islands (NWHI) are a chain of ten small islands and atolls north and west of the eight main Hawaiian Islands and much of this area is encompassed by the Papahānaumokuākea Marine National MonumentExit. Thus, the Earth’s coral reefs are mainly concentrated towards their western margins (see global map, below), a distribution pattern that generally corresponds to the occurrence of shallow submarine platforms within tropical seas. 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