Photo of the Day

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

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