An iceberg the size of Papakura district in southern Auckland has broken off a giant glacier in northern Greenland.
Images from a NASA satellite show the iceberg, measuring 118 square kilometres, has separated from the Petermann Glacier, the BBC reports.
Scientists have expressed concern about the extent of the changes to the glacier in the past three years.
In 2010, an ice island measuring 250sq km calved from the same glacier.
The scientists say the Greenland ice shelf is thinning extensively because of global warming.