A23a broke off from Antarctica’s Filchner Ice Shelf in 1986, and remained grounded on the seabed in the Weddell Sea for over 30 years before beginning its slow journey north in 2020.

However, A23a may not hold its size title for long, because as of May 16, it is only around 12 square miles (31 square km) larger than the next-biggest iceberg, D15A, according to the U.S ...

If A23a breaks up, it could be dangerous for ships navigating the treacherous Southern Ocean. “It’s the stormiest, most unpleasant ocean in the world,” says Siegert.

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.

When you buy through links on our articles, Future and its syndication partners may earn a commission. The world's largest iceberg, A23a, is spinning north of Antarctica and it probably will do so ...

About the size of Rhode Island, the iceberg known as A23a got stuck in an ocean vortex this summer, spinning in place for months. Now, it's free, and heading back into open Antarctic waters.

The A23a iceberg, deemed the largest in the world since 2023, was seen losing large chunks of ice after drifting toward the island of South Georgia. The world’s largest iceberg, A23a, has run ...

Megaberg A23a might be on the verge of running into South Georgia and surrounding islands in the South Atlantic. The result could spell trouble for wildlife on those islands, and A23a's movement ...

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.