The world’s biggest iceberg

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The world's biggest iceberg, A23a, is on the move after being grounded in the Weddell Sea for more than 30 years. A23a split from the Antarctic coastline in 1986 and has an area of almost 4,000 sq km (1,500 sq miles), making it more than twice the size of Greater London. The iceberg is approximately 400m (1,312 ft) thick, which is taller than the London Shard, Europe's tallest skyscraper at 310m1. A23a is now drifting past the northern tip of the Antarctic Peninsula and is expected to enter the Antarctic Circumpolar Current, which will likely direct it towards the South Atlantic on a path known as "iceberg alley"13. The movement of A23a could pose a threat to wildlife near South Georgia Island, as its massive size could disrupt the foraging routes of seals, penguins, and other seabirds, potentially preventing them from feeding their young properly1.
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