In mid-May 2021, A-76, currently the world's largest floating iceberg, calved from the Filchner–Ronne Ice Shelf in Antarctica. According to the news, the new iceberg, effectively a piece of floating ice shelf, detached from western side of the Ice Shelf. It now floats in the Weddell Sea. The iceberg is about 170 km long and 25 km wide, and is described as being "shaped like a giant ironing board". The size at calving was an estimated 4320 square km. The new iceberg was first spotted by Keith Makinson, a polar oceanographer with the British Antarctic Survey in May 2021.