From the Editor's Desk

Why Earth's oceans aren't all equally salty

“Water, water, every where / Nor any drop to drink,” laments the Ancient Mariner. That’s because the ocean surrounding his ship is too salty. Our bodies can’t process the salt in seawater, and drinking it would actually dehydrate you further. You could drink the whole ocean and still be thirsty.

All of Earth’s oceans, and all bodies of water connected to them, are salty — the result of millions of years of mineral runoff carried by rivers to the sea. However, this map shows a considerable and consistent variation in salinity levels across the world’s marine domains.

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