Story highlights The Larsen C has been steadily breaking free of the Larsen Ice Shelf

Some fear a drifting Larsen C could pose a danger to ships

(CNN) A huge ice sheet more than half the size of Qatar could soon break off from Antarctica.

If the Larsen C breaks free, it'll be one of the world's biggest ever icebergs, measuring 6,000 square kilometers or 2,300 square miles.

That's the size of four Londons or more than seven New York Citys.

Larsen C is a portion of the greater Larsen Ice Shelf on the northeastern coast of Antarctica.

At 6,000 square kilometers, the Larsen C ice sheet could be one of the world's biggest ever icebergs. Source: European Space Agency

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