The Sargasso Sea is the largest region of the Atlantic Ocean, with an area of about 3.5 million km2. Unlike other regions called seas, the Sargasso Sea isn’t bordered by land. The reason it’s still called a sea is that it is bordered by four ocean currents, forming a clockwise gyre surrounding it, just as if it had a coastline. It lies in the North Atlantic Ocean, in-between the Canary Islands, the east coast of the United States and the Caribbean Sea. Unlike the neighboring currents, the waters of the Sargasso Sea are very calm.
The Sargasso Sea is named after Sargassum, a type of brown algae that is often seen floating on the surface of this sea.