1986 in Antarctica

thumb|A23a as observed during RV POLARSTERN cruise PS96 in 2016 in the central Weddell Sea. Due to its age of 30 years, it is strongly eroded. thumb|Iceberg A23a nearing South Georgia on 20 February 2025 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. its area was about , which made it the largest iceberg in the world. 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 Se