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The world’s largest iceberg is once again on the move, drifting through the Southern Ocean after months of being trapped and spinning in place.Spanning an impressive 3,672 square kilometers (1,418 square miles) as of August—slightly larger than Rhode Island—iceberg A23a has been closely monitored by scientists since it broke away from the Filchner-Ronne Ice Shelf in 1986. For over 30 years, it remained stuck in the Weddell Sea’s shallow seabed until shrinking sufficiently to escape, according to CNN. It was then carried by ocean currents before becoming trapped again in the Taylor column—a swirling vortex created by currents colliding with an underwater mountain.