a group of islands formed by coral deposition
Coral island Most of the world's coral islands are in the Pacific Ocean. The American territories of Jarvis, Baker and Howland Islands are clear examples of coral islands. Also, some of the islands belonging to Kiribati are considered coral islands. The Maldives also consist of coral islands. St. Martin's Island is an 8Â km2 coral island located in Bangladesh. Coral islands are also located near Pattaya and Koh Samui, Thailand.
Great Barrier Reef The Great Barrier Reef is the world's largest coral reef system[1][2] composed of over 2,900 individual reefs[3] and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi).[4][5] The reef is located in the Coral Sea, off the coast of Queensland, Australia.