<p>Silversides swirl through mangroves like a river in the sea. The dense forest of roots offers welcome shelter for the finger-size fish, which form large schools to try to confuse predators. Mangroves enhance reefs by providing a nursery area for vulnerable creatures and by trapping sediment that can smother coral. They also store carbon that might otherwise contribute to global warming. </p> <p><i>This photo originally published in "<a href="http://www.nationalgeographic.com/magazine/2016/11/cuba-coral-reefs-caribbean-marine-preserve-national-parks/" target="_blank">Cuba’s Underwater Jewels Are in Tourism’s Path</a>," in November 2016.</i></p>

Silversides swirl through mangroves like a river in the sea. The dense forest of roots offers welcome shelter for the finger-size fish, which form large schools to try to confuse predators. Mangroves enhance reefs by providing a nursery area for vulnerable creatures and by trapping sediment that can smother coral. They also store carbon that might otherwise contribute to global warming.

This photo originally published in "Cuba’s Underwater Jewels Are in Tourism’s Path," in November 2016.

Photograph by David Doubilet and Jennifer S. Hayes, National Geographic

Best Underwater Photos of 2016

From Cuba's underwater ecosystem to swimming with sharks in the Bahamas, National Geographic presents the best underwater photos of the year

In truth, we don’t often publish underwater photos. Not because they’re frivolous or hollow, but because they’re so hard to get. So few photographers have the knowledge and skill set to access remote parts of the ocean, to say nothing of the specialized and costly equipment. Which is why, when we do receive enchanting underwater images from our photographers in the field, we're eager to publish them.

Most of our top underwater shots of 2016 come from intrepid divers David Doubilet and Brian Skerry. Doubilet shot on assignment in Cuba’s offshore ecosystems. Skerry swam with sharks in the Bahamas. Other images came from unlikely places, including Charlie Hamilton James’s photographs of cutthroat trout and wild beavers in the Greater Yellowstone Ecosystem.

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