Nan Madol is located near the southern side of the Federated States of Micronesia. It is the only ancient city ever built atop a coral reef.

Nan Madol: The City Built on Coral Reefs

One of the oldest archaeological sites not on a heritage list, this Pacific state, like Easter Island, is an engineering marvel

Unknown in the Americas 30 years ago, lionfish have multiplied at a rate that is almost unheard of in marine history.

Invasion of the Lionfish

Voracious, venomous lionfish are the first exotic species to invade coral reefs. Now divers, fishermen—and cooks—are fighting back

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The Miracle of the Reef

Coral spawn only once a year, and at night; how they manage to synchronize remains a mystery

The Great Barrier Reef

Diving Into the Great Barrier Reef

Beautiful beaches and unrivaled underwater views lure lovers of marine life to the world’s largest coral reef

A gray reef shark swims over corals in remote Kingman Reef in the Line Islands. Researchers believe that a large number of sharks is indicative of healthy reefs.

Deep Trouble

Coral reefs are clearly struggling. The only debate for marine scientists is whether the harm is being done on a local or global scale

Lake Champlain's Isle La Motte is rich in marine fossils, some of which are 450 million years old.

Paleozoic Vermont

What’s the world’s oldest communal ocean reef doing in the Green Mountain State?

A Return to the Reefs

With the world’s coral reefs in crisis, the author’s childhood memories guide a far-reaching study of the problem in the Bahamas

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Rapture of the Deep

Pennekamp State Park—the nation’s first coral-reef santcuary—protects a thriving ecosystem beneath the waves

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