More than two miles (three kilometers) under the sea, scientists have found a volcanic wonderland unlike any other place on Earth.

Photos: ROV Reveals New Volcanic Vents Teeming With Life
Native to the Indo-Pacific, lionfish are a carnivorous, venomous fish and invasive species that threaten marine habitats in the Atlantic. Nat Geo Explorer Erin Spencer is helping to remove these maroon-and-white-striped fish from ecosystems throughout the Florida Keys. #LetsExplore

Lionfish Hunting in the Florida Keys
Whether you feel like looking for shells, running with your dog, or marveling at richly colored sand, the ocean—and the land—have a beach for you.

21 Best Beaches in the World
"It is the blue heart of coastal East Africa—an unspoiled stretch of coastline that must be protected at all costs—for our ocean heritage."

An Explorer's Guide to Mozambique
This shark needed a mate about as much as it needed a bicycle.

Shark Surprises Aquarium With Rare 'Virgin Birth'
Researchers don’t yet know what caused the animals to beach themselves.

82 Dolphins Die in Mysterious Mass Stranding
Axial Seamount off the Oregon coast gave geologists the show of a lifetime thanks to careful predictions and a network of sunken sensors.

Underwater Volcano Offers Rare Look at Eruption in Real Time
"The ocean is not too big to fail. These precious places could easily be lost, and few would even realize it. My hope is that we all look to the future, and take the action necessary to ensure a rich future for all." - Nat Geo Explorer Brian Skerry

Election Issues Through the Lens of National Geographic Photographers
Humpback whales normally travel in pods of two to three individuals, but this stunning footage shows a much larger group migrating off the coast of Cape Town, South Africa.

Watch: Mesmerizing Drone Footage of Humpback Whale Pod
More than a hundred million sharks are killed each year, primarily for their fins. Brian Skerry goes to extraordinary lengths to highlight their importance—and show us their beauty.

Through a Photographer's Lens, Sharks Get a Makeover
Expedition leader Paul Rose has been wanting to reach Tristan da Cunha since he was 10 years old. As a new expedition brings him there at last, he already feels part of the family.

'The Remotest Island,' the Warmest Welcome!
The massive, alien-like land coconut crab was once commonly found on many tropical Indo-Pacific islands, but its numbers have been greatly reduced due to overhunting and habitat destruction. Nat Geo Explorer Tim White is investigating which habitats must we protect to ensure the species’ long-term survival. #LetsExplore

Tracking the World's Largest Land Crab
Did you know? Sailfish are the fastest fish in the ocean and have been clocked leaping out of the water at more than 68 mi (110 km) per hour.

Sailfish Photos and Facts - National Geographic
Citizen scientists and star-mapping technology help marine biologist Brad Norman study the elusive whale shark.

Tracking the Sea's Gentle Giants
The gear is ready. Now for the most important work: biosecurity.

Preparing the Team, Protecting the Islands
NASA scientists been flying research planes over the North and South Poles in order to gather more data on the impact of warming temperatures. Here's what they've seen.

Climate Change Captured in Stunning Antarctic Ice Photos
New regulations in southern China aim to protect coral reefs by putting an end to the thriving trade in giant clam carvings and other handicrafts.

China Tries to Crack Down on Giant Clam Poaching
In collaboration with the Royal Society for the Protections of Birds (RSPB) and the Tristan da Cunha government, National Geographic Pristine Seas is conducting an expedition to Tristan da Cunha and its surrounding islands.

Setting Sail for Tristan da Cunha