Jarvis Island. A coral island is the result of an atoll whose lagoon has dried up or been filled in with coral sand and detritus. This state is typically the last in the life cycle of an island, the first being volcanic and the second being an atoll. Most of the world’s coral islands are in the Pacific Ocean. The American territories of Jarvis Island is clear examples of coral islands.
Pacific Remote Islands protection not just a drop in the ocean | This fall, President Obama signed a proclamation that created the biggest marine reserve in the world. By extending the protective boundaries around Wake Island, Jarvis Island and Johnston Atoll from 50 to 200 nautical miles, the Pacific Remote Islands Marine National Monument netted a six-fold increase in area.