Giant iceberg starts to break up in the South Atlantic The A68a iceberg has been on a potential collision course with the British overseas territory of South Georgia for some weeks. Researchers are concerned about its impact as it starts to break up. The massive A-68A iceberg has been drifting toward South Georgia for several weeks There is growing concern over a collosal iceberg on a collision course with the British territory of South Georgia, a largely uninhabited South Atlantic island of roughly the same size. Measuring 158 kilometers long (98 miles) and 48 kilometers wide, A68a — as the iceberg is called — is believed to be the biggest currently in the southern ocean, and one of the largest on record.