Which sea is known as the only sea that has no shores?

The Sargasso Sea is recognized as the only sea that does not have shores. It is distinct from other seas because it is bounded by four currents that form an ocean gyre in the Atlantic Ocean. This unique positioning means that it is enclosed entirely by water, without any landmasses or beaches surrounding it. The Sargasso Sea is notable for its deep blue water, diverse marine life, and dense concentrations of floating seaweed, known as sargassum, which provides a distinct habitat for various species.

In contrast, the other options listed are all bordered by land and coastlines, which disqualifies them from being characterized as seas without shores. The Red Sea, for instance, is situated between northeastern Africa and the Arabian Peninsula, boasting extensive coastlines. The Dead Sea is located between Jordan and Israel, also featuring shorelines that define its boundaries. The Caribbean Sea lies to the south of the United States and is bordered by numerous islands and coastlines along Central and South America. Thus, the Sargasso Sea stands out uniquely as a body of water defined by its lack of direct land contact.