Just months ago, the world’s largest iceberg weighed about a trillion tons and covered an area nearly the size of Anchorage, Alaska. Now it’s less than half that—and rapidly disappearing.

In recent weeks, massive chunks of ice measuring up to 250 square miles (400 square kilometers) have sloughed off the ‘megaberg’ known as A23a. Smaller pieces float freely in the surrounding waters too, many of them still big enough to threaten ships.

The iceberg’s disintegration has reduced its total area to 683 square miles (1,770 square kilometers), according to an Agence France-Presse analysis of satellite images captured by the European Union Earth observation monitor Copernicus. It could disappear completely within weeks.

Andrew Meijers, a physical oceanographer from the British Antarctic Surve

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