That ring is Ahe Atoll, one of dozens of low-lying formations scattered across French Polynesia's Tuamotu Archipelago. What ...

Hovering underwater, I felt as if I were witnessing a form of planetary circulation. Nutrients moving from forest to coast, ...

The ring-shaped coral islands known as atolls, like this one in the Maldives Islands in the Indian Ocean, may trace their formation to sea levels repeatedly rising and falling over hundreds of ...

Hydrogen bombs turned remote coral atolls into proving grounds, and the blast waves have never really stopped. In the Marshall Islands and across the wider Pacific, the fallout still shapes landscapes ...

Every reef has its own personality, but a few stand out with good reason. While the Great Barrier Reef is undeniably a world-class dive experience, other coral reefs do a spectacular job illustrating ...

Japan has raised global concern, after reportedly taking initial steps to explore a tiny ...