10.Reed Bank · 3,423 square miles (8,866 sq km) · Philippines
Reed Bank, Reed Tablemount, or Recto Bank is a large tablemount in the South China Sea.
9.Great Chagos Bank · 4,633 square miles (12,000 sq km) · Maldives
The Great Chagos bank is the second largest atoll in the world. It has a total area of more than 12,000 square kilometers. It is located in the Maldives.
8.Saya Del Malha · 15,444 square miles (40,000 sq km) · Indian Ocean
The Saya de Malha Banks in the Indian Ocean are the largest submerged banks in the world. This ridge connects the Seychelles and Mauritius islands along the Mascarene Plateau. Along with its coral reefs, the marine habitat includes feeding grounds for the green turtle and breeding grounds for blue whales.
7.Zhongsha Islands · 50 miles (81 km) · South China Sea
This is an atoll that is 50 miles long and has an area of 6,448 square kilometers. This atoll is claimed by the People's Republic of China, Taiwan and the Philippines.
6.Andros Coral Reef · 124 miles (200 km) · Bahamas
The Andros Barrier Reef in the Bahamas stretches more than 124 miles. The island sits along the edge of an oceanic trench known as the Tongue of the Ocean. This means the reef extends downwards along the trench to a depth of 6,000 feet instead of lying flat along the ocean floor.
5. Florida Reef · 200 miles (322 km) · Atlantic Ocean and Gulf of Mexico near Florida
The reef system around the coast of Florida stretches from the Atlantic ocean around to the Gulf of Mexico near Key West. This reef system is thought to be about 7,000 years old. It is 322 kilometers long.
4.The Mesoamerican Barrier Reef · 585 miles (943 km) · Atlantic Ocean near Mexico
The Mesoamerican Barrier Reef System stretches along the eastern coast of Central America. From its northern point off the Yucatan Peninsula in Mexico to the southern coast of Honduras, the reef reaches a total of 585 miles.
3.New Caledonia Barrier Reef · 932 miles (1,500 km) · Pacific Ocean
This coral reef is nearly 1,500 kilometers in length, near the former French colony of New Caledonia in the Pacific Ocean. Some parts of the reef have been damaged by nearby nickel mining, but the overall health of this reef is sound.
2.Red Sea Coral Reef · 1,180 miles (1,900 km) · Egypt
The Red Sea Coral Reef off the coasts of Egypt, Israel and Saudi Arabia is approximately 5,000 to 7,000 years old. Ten percent of the 1,200 species found in this reef live only in this area. The Red Sea Coral Reef includes the Dahab Blue Hole, one of the most popular and dangerous dive sites in the world.
1.Great Barrier Reef · 1,553 miles (2,500 km) · Australia