The Sargasso Sea in the North Atlantic Ocean, near the Caribbean, is unlike any other sea in this planet. The boundaries of the sea are defined not by landmasses, but by four currents that swirl clockwise around the Bermuda forming a vast whirlpool called the North Atlantic gyre. The Sargasso Sea is part of this gyre. These ocean currents bring marine plants and debris from far away and deposit them into the gyre, yet the ocean water in the Sargasso Sea has a deep blue color and exceptional clarity. But the most defining characteristic of the Sargasso Sea is the presence of a seaweed called sargassum, that exist in large floating mats hundreds, and sometimes thousands of kilometers long. The Sargasso Sea got its name from this weed.
Sargassum seaweed. Image credit: Oliver S/Shutterstock.com
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