Photo of the Day

blacktip sharks, bluefin trevallies, and twinspot snappers underwater in the southern Line Islands
September 3, 2014

Pooled Together

Blacktip sharks, bluefin trevallies, and twinspot snappers (foreground)—ever watchful for a potential meal—throng a shallow passage into the lagoon of Millennium Island in the southern Line Islands, a pristine Pacific archipelago. Top predators like these are a defining feature of the world’s healthiest coral reefs.

See more pictures from the September 2014 feature story “A World Apart: The Southern Line Islands.”

Learn more about the Pristine Seas initiative »

Photograph by Brian Skerry, National Geographic

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