A clump of sargassum weed the size of a soccer ball drifts near Bermuda in the slow swirl of the Sargasso ... Sea, likened sargassum to a “carpet of weeds.” Photograph by David Doubilet No ...

Sargassum was moved from the Sargasso Sea to the tropics via currents depicted by arrows. Credit: Figure from Jouanno et al. (2025). The Great Atlantic Sargassum Belt has puzzled researchers since ...