I looked it up and it's about 1500 sq. miles in area and around 3500' thick.
https://oceanographicmagazine.com/news/ ... ern-ocean/
Excerpt:
The world’s largest and oldest iceberg, a ‘mega-berg’ double the size of Greater London and weighing more than one trillion tonnes, has made a break for it.
After decades being grounded on the seafloor and more recently, spinning on the spot, this mega-iceberg has now broken free from its position north of the South Orkney Islands and is now drifting in the Southern Ocean.
The colossus iceberg, named A23a is twice the size of Greater London. It also weighs a whopping one trillion tonnes. It was calved from Antarctica’s Filchner Ice Shelf in 1986 and remained grounded on the seabed of the Weddell Sea for over 30 years, before beginning its slow journey north in 2020.
It’s a journey that has been marked by a series of intriguing scientific events. For months, the iceberg was trapped in a Taylor Column, an oceanographic phenomenon in which rotating water above a seamount traps objects in place.
It was this dynamic that kept A23a spinning in one spot, delaying its expected rapid drift north.
Having now made a break for it, it’s anticipated A23a will continue its journey into the Southern Ocean following the Antarctic Circumpolar Current, which scientists at the British Antarctic Survey believe will drive it towards the sub-Antarctic island of South Georgia. Once in this region, it will encounter warmer water where it will be expected to break up into smaller icebergs and eventually melt.
This event demonstrates one of the major differences between the Antarctic (which is a large continent like any other, except covered in ice) and the Arctic which has no equivalent land. Arctic ice is sea ice that forms in the Arctic ocean rather than on land, so you don't see the kind of 'calving' from enormous ice sheets that are common in the Antarctic.
