Largest iceberg (current)

The largest current iceberg is D15A, which was measured at 51 x 22 nautical miles (94 km x 40 km), and is approximately 3,050 km2 (1,180 sq mi) in area as of April 2026. D15A broke off the West Ice Shelf in East Antarctica in January 2016 but took over the record in late 2025, following the demise of the long-lived A23A.

D15A's predecessor, A23A, was an unusually long-lived iceberg, having detached from the Filchner Ice Shelf in August 1986 but soon became stuck on the sea-floor of the Weddell Sea. However, after almost 30 years in the same position, it began to move in earnest in early 2022 and, by November 2023, it had reached the northern tip of the Antarctic Peninsula. After that, its journey northwards along "iceberg alley" into much warmer waters of the South Atlantic saw it fragment and shrink dramatically, until eventually losing its world-record status at the end of 2025.

The largest iceberg ever was in excess of 31,000 km2 (12,000 sq mi). It was 335 km long and 97 km wide (208 x 60 mi) – larger than Belgium – and was sighted 240 km (150 mi) west of Scott Island, in the Southern Ocean by the USS Glacier on 12 November 1956. The extent of the iceberg witnessed by the crew of the USS Glacier was estimated, as they did not have the benefit of satellite photography.

The largest iceberg reliably assessed using satellite imagery is B15, which calved from Antarctica's Ross Ice Shelf in March 2000 and, according to NASA, measured approximately 300 km long by 40 km wide (186 x 25 mi), with a surface area of 11,000 km2 (4,250 sq mi).