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seas

Sea
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Sea

The Dead, the Red, and the Mediterranean are seas you may know. But our planet has more than 50 seas, and they’re not to be confused with oceans. All are salty, but they differ in many ways.

Discover the major types of seas and more, including why some are landlocked and the saltiest one on Earth.

National Geographic
Brilliantly Glowing Jellyfish Terrorize the Black and Caspian Seas

Brilliantly Glowing Jellyfish Terrorize the Black and Caspian Seas

Discover the damage a jellyfish native to New England is doing in other seas — and the cause of this commotion. More...

Article
Scientific American
Map Quiz Game:  World’s Oceans, Seas, and Lakes

Map Quiz Game:  World’s Oceans, Seas, and Lakes

Time yourself and your geography prowess when it comes to Earth’s bodies of water. More...

Interactive
Seterra
The World’s Largest Seas

The World’s Largest Seas

Discover the top 10 seas on Earth based on area in square miles, from the Mediterranean to the Andaman, with the Gulf of Mexico in the middle. More...

Article
About.com
What Is the Sargasso Sea?

What Is the Sargasso Sea?

An area of the Atlantic Ocean named for a free-floating seaweed is the world's only sea without a land boundary. Find out all about the wide Sargasso Sea. More...

Article
NOAA
Ancient Shipwrecks of the Black Sea

Ancient Shipwrecks of the Black Sea

A preserved wooden shipwreck more than 2,500 years old lies on the bottom of the Black Sea. Watch to find out why this environment’s conditions make it so valuable to scientists. More...

Video
National Geographic
Mediterranean and Black Sea Sharks Risk Extinction

Mediterranean and Black Sea Sharks Risk Extinction

Thanks to overfishing and other bad practices, shark populations in the Mediterranean and Black Sea may go extinct. Research what this means for the ecosystems of these seas. More...

Article
FAO/UN
Ocean vs Sea

Ocean vs Sea

Smaller than an ocean, salty, and partially enclosed by land: That’s what defines a sea. Learn the locations of the 6 largest seas and other salient facts. More...

Article
Diffen.com
Sea Level Rise and Coastal Flooding Impacts

Sea Level Rise and Coastal Flooding Impacts

See how rising levels of the sea and tidal flooding will affect areas in the United States, even the street where you live. More...

Interactive
NOAA
Shrinking Aral Sea

Shrinking Aral Sea

Irrigation made the desert fertile for cotton and other crops, but it destroyed the Aral Sea. Take a look at the shrinking of what was once the fourth largest sea on the planet. More...

Article
NASA
Stone Mystery in Sea of Galilee

Stone Mystery in Sea of Galilee

A giant boulder structure in the Sea of Galilee posed a puzzle to archaeologists. Discover what closer inspection revealed and how it reached its submerged location. More...

Article
Discovery
Welcome to Sea Dwellers!

Welcome to Sea Dwellers!

Get up close and personal with some of creatures of the sea: barking California sea lions, venomous Caledonian stingers, chirping manatees, and more. More...

Interactive
PBS

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