There are also "rivers" in the ocean, which are warm currents and cold currents that flow directionally in the ocean. The sargasso sea lies between the Gulf Stream and the Atlantic Warm Current. Two warm currents flow clockwise around the the sargasso sea all the year round, causing the surface seawater to gather towards the center, forming the so-called "Sargasso water" with a thickness of hundreds of meters. The water temperature is above 25℃ all the year round, which is most suitable for the growth and reproduction of Sargassum. As a result, this sea area has become the most lush sea area for Sargassum to grow and reproduce.