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A23a Iceberg Disintegration
July 24 , 2026
15 hrs 0 min
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- The world’s largest iceberg, A23a, has broken into smaller fragments in the South Atlantic Ocean after drifting for nearly 40 years.
- A23a calved from the Filchner-Ronne Ice Shelf, Antarctica, in 1986 and remained grounded on the ocean floor for decades before beginning its long drift.
- It covered an area of around 3,900 sq km at its peak, making it one of the largest icebergs ever recorded and larger than many cities.
- The iceberg drifted through the Weddell Sea and later entered the South Atlantic, where warmer waters accelerated melting and fragmentation.
- Its breakup was caused by prolonged exposure to warmer ocean currents, wave action and meltwater, reflecting changes in Antarctic environments.
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