A23a Earth’s Βiggest Ιceberg. © Copernicus Sentinel data (2025), processed by ESA
The Ocean and Land Colour Instrument on the Copernicus Sentinel-3 satellite took this image of the Earth’s biggest iceberg, A23a, on 5 April 2025.
The iceberg is currently stuck on the seabed, about 73 km from the remote island of South Georgia, which is just visible under the clouds.
Even though the island can’t be seen clearly in the image, it’s only slightly larger than the iceberg. A23a is estimated to cover 3460 square kilometers — about twice the size of Greater London. South Georgia is a bit bigger at 3528 square kilometers.
A23a Earth’s Βiggest Ιceberg. © Copernicus Sentinel data (2023), processed by ESA
ESA also shared an image of the iceberg in December 2023 when it broke free from the ocean floor and started drifting away from Antarctica. It originally broke off from the Filchner Ice Shelf in 1986 and has traveled over 2000 kilometers since then.
source ESA
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