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Saturday, March 7, 2026

Giant Iceberg 25x Larger Than Delhi Nears Breakup in Atlantic

Key Takeaways

  • The world’s largest iceberg, A23a, is drifting toward warmer waters where it is expected to break apart.
  • Satellites are tracking its journey into the South Atlantic via “iceberg alley.”
  • The iceberg is about 25 times larger than Delhi, covering 4,300 square kilometres.

The colossal iceberg A23a, a frozen giant 25 times the size of Delhi, is on a collision course with warmer, turbulent seas where it is predicted to fracture and melt. Satellites are providing a constant vigil as it drifts toward a critical point in the South Atlantic Ocean.

This Copernicus Sentinel-2 image over the South Atlantic Ocean features a close-up view of the A23a iceberg. (Photo: ESA)
This Copernicus Sentinel-2 image over the South Atlantic Ocean features a close-up view of the A23a iceberg. (Photo: ESA)

From Grounded Giant to Drifting Behemoth

The European Space Agency’s Copernicus Sentinel-1 satellite has been tracking A23a, which broke off from Antarctica’s Filchner Ice Shelf in 1986. After being stuck on the seafloor for over 30 years, it began moving in 2020 and has steadily gained speed.

It is now drifting away from Antarctic waters, heading for the northeast tip of the Antarctic Peninsula. There, it will be caught by the powerful Antarctic Circumpolar Current.

The Path to Breakup: “Iceberg Alley”

This current will funnel the iceberg into a pathway known as “iceberg alley” in the South Atlantic. The ESA states this is where its fate will be sealed.

“In this region, the A23a iceberg will be exposed to warmer waters and more turbulent seas, which will likely lead to its breakup,” the agency said.

A23a
A23a

Sheer Scale and Ongoing Melt

The sheer scale of A23a is staggering. It spans approximately 4,300 square kilometres. For perspective, Delhi covers 1,484 square kilometres, making the iceberg nearly 25 times larger.

Satellite data already shows it shedding significant ice. As currents carry it north into warmer waters, the melting process will accelerate dramatically.

Constant Satellite Surveillance

The Copernicus Sentinel-1 mission uses radar to see through cloud and polar darkness, providing year-round monitoring of polar regions and drifting icebergs like A23a. Scientists will continue to watch its trajectory and assess the environmental impact of its final breakup and melt.

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