Sargasso Sea defined by ocean currents rather than land

The Sargasso Sea, located in the North Atlantic Ocean, is unique for being the only sea on Earth that has no land boundaries. Instead of being defined by coastlines, its borders are formed by four powerful ocean currents: the North Atlantic Current to the north, the Canary Current to the east, the North Equatorial Current to the south, and the Gulf Stream to the west.

Covering approximately 3 million square kilometers, the sea is characterized by its vast expanses of Sargassum seaweed. Historically, the region presented challenges for sailors; Christopher Columbus recorded encounters with thick seaweed and periods of calm winds during his 1492 voyage. While these conditions once caused fear among mariners, modern motorized vessels can navigate the area more easily.

The sea reaches depths of about 5,000 meters and is known for its clear waters. Its unique hydrodynamic structure creates a distinct micro-ecosystem within the Atlantic.