Ever heard of iceberg A23a?  It calved in 1986 and is now the  largest , verified by Guinness World Records. 263 cubic miles. 40 nautical miles by 32 nautical miles space. In 2021,  iceberg A-76  broke off from the Ronne Ice Shelf off the Weddell Sea, and was larger, but soon fractured. But the absolute largest was Iceberg B-15, about the size of Jamaica.  Calved from the Ross Ice Shelf, also Antarctica, on March 2000.  There is still a small piece, B-15AB that has grounded in the western sector of Antarctica's Amery region. About A23a, it is twice the size of Greater London, UK. Detached from the  Antarctica Filchner Ice Shelf in 1986. Was for a long time stuck on the sea-floor of the Weddell Sea, but in 2013 began wandering north toward the South Georgia Island of the Southern Ocean. There are, of course, other icebergs in the Atlantic off Antarctica. Here are the  icebergs just from Greenland. The town of Ilulissat on the shores of Disko Bay in...