Australian authorities say the Great Barrier Reef has experienced its greatest annual loss of live coral in four decades.

Jul 7, 2025 Bleached coral is visible Sept. 16, 2023, at the Flower Garden Banks National Marine Sanctuary off the coast of ...

Coral Gardeners (@coralgardeners) is, according to its website, “on a mission to revolutionize ocean conservation and create a global movement to save the world’s coral reefs through active ...

Aug 13, 2022 — August 3, 2023: Corals on shallow reefs bleached and died after being exposed to sunlight and air during a low tide event. Almost one year later, the top of the same reef was over ...

At the beginning of 2019, coral cover in parts of the Great Barrier Reef was at record lows. Heat waves in 2016 and 2017 killed huge swaths of coral there; 30% of the coral died after the heat ...

Corals in Australia's Great Barrier Reef spawned last week — a mysterious synchronized ritual. Photos and video show snowstorm-like flurries of colorful coral eggs and sperm filling the water.

The idea isn't necessarily a new one. The creation of artificial coral reefs has been going on for years, but the use of 3-D print technology in the process is relatively new.

Here, divers explore a coral wall in this dim, blue world. Researchers found that shallow corals from about 10 feet (3 meters) depth could barely survive when brought down to 213 feet (65 meters).

The reef is between 164 and 328 feet (50 and 100 meters) deep, and South American researchers who mapped it from the surface estimate that it covers about 3,668 square miles (9,500 square kilometers).

A version of this article appears in print on Jan. 22, 2022, Section A, Page 7 of the New York edition with the headline: ‘Pristine’ Coral Reef Resembling Bed of Roses Is Found Off the Coast ...