A23a

Iceberg A23a is a large tabular iceberg which calved from the Filchner–Ronne Ice Shelf in 1986. It was stuck on the sea bed for many years but then started moving in 2020. As of January 2025, its area was about 3,500 square kilometres (1,400 sq mi), which made it the largest iceberg in the world. As of March 2025, it had run aground off South Georgia island. By July 2025, it had started drifting again. It later passed to the east and north of South Georgia, and in September 2025 it was observed to be breaking up in warmer waters.

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