4 Petermann Glacier-shutterstock_5187643.jpg

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The largest Arctic iceberg in half a century was first noticed in 2010. A chunk of ice four times the size of Manhattan has calved from Greenland's Petermann Glacier. It is one of the two largest remaining glaciers in Greenland that terminate in floating shelves, according to Live Science. The  new ice island had an area of at least 100 square miles and a thickness up to half the height of the Empire State Building.