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A23a is a large tabular iceberg which calved from the Filchner–Ronne Ice Shelf in 1986. It was stuck on the sea bed for many years but then started moving in 2020. As of January 2025, its area is about 3,500 square kilometres (1,400 sq mi), which makes it the current largest iceberg in the world. [2] [3] [4]
A massive iceberg, known as A23a, is on an apparent collision course with South Georgia Island, a British territory in the South Atlantic Ocean. The giant sheet of ice, which originally broke off ...
Known as A23a, the 1,400-square-mile iceberg had been stuck on the ocean floor near Antarctica for 37 years after splitting in 1986 from the Antarctic’s Filchner Ice Shelf.
The iceberg is about three times the size of New York City and more than twice the size of Greater London World’s largest iceberg on the move again after months spinning on the spot Skip to main ...
November 27: The British Antarctic Survey confirms that the world's largest iceberg, A23a, is now leaving the Weddell Sea and drifting into the Southern Ocean after being in the Weddell Sea for more than 30 years. The iceberg is expected to follow the Antarctic Circumpolar Current and continue to drift away from Antarctica. [3]
The colossal iceberg known as A23a has been slowly spinning in one spot of the Southern Ocean since April. Here’s what experts have to say on the phenomenon.
In 1986, satellite images revealed ice breakup near Druzhnaya I. It drifted to sea in 1986 when the ice it was on broke from the main ice shelf as iceberg A23a. [5] It was later discovered at sea by the ship Kapitan Kondratyev. Its equipment and prefabricated structures were airlifted to Druzhnaya III shortly after its construction. [6]
A23a has held the “largest current iceberg” title several times since the 1980s, occasionally being surpassed by larger but shorter-lived icebergs, including A68 in 2017 and A76 in 2021.