Sargassum in the Atlantic has reached record levels in 2025, with an estimated volume of 31 million metric tons, according to the Sargassum Watch System (SaWS), an initiative of the College of Marine Science at the University of South Florida (USF). This marks a 40% increase over the previous record set in June 2022.
Stretching over 5,500 nautical miles from the west coast of Africa to the Gulf of Mexico, this massive belt of floating algae is affecting key regions of the Caribbean, as well as the Florida coastline, including the Florida Keys, Key Biscayne, and other popular tourist areas. Satellite imagery released by USF and NOAA Coral Reef
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