Antarctic iceberg A23a, which calved from the Filchner-Ronne Ice Shelf in 1986, is rapidly breaking apart in the South Atlantic as of early September 2025, leaving fragments up to 400 km2 (154 mi2) adrift.
The world’s largest iceberg, A23a, ran aground near the sub-Antarctic island of South Georgia on March 1, 2025. The iceberg remains stationary approximately 90 km (56 miles) from land, raising concerns about its potential impact on marine ecosystems and navigation.
The world’s largest iceberg, A23a, is steadily approaching South Georgia, a British overseas territory. The iceberg is currently about 280 km (173 miles) from the island and could make contact within 2 to 4 weeks.
