This perfectly rectangular mile-long iceberg was discovered floating in the Antarctic

This perfectly rectangular mile-long iceberg was discovered floating in the Antarctic

The tweet described the iceberg as having split from the Larsen C ice shelf, or large blocks of ice connected to land but continue to float in the ocean.

Kelly Brunt, a glaciologist at the University of Maryland and Nasa, said tabular icebergs gain their distinctive shape when an angular protrusion breaks off from an ice shelf.

Well here's something you don't see everyday: an iceberg so unbelievably geometric in shape you'd think it was deliberately carved with a very big chainsaw.

The image was taken as part of NASA's Operation Icebridge, which involves photographing Earth's polar ice to better understand connections between polar regions and the global climate system.

"The iceberg's sharp angles and flat surface indicate that it probably recently calved from the ice shelf".

A NASA spokesman said: "It will yield an unprecedented three-dimensional view of Arctic and Antarctic ice sheets, ice shelves and sea ice".

She said there were two types of iceberg.

"How the berg is formed is speculative given the collisions are not known in much detail, nor is the physical state of the iceberg - many rifts are visible in satellite imagery, many are not yet visible but are forming as the berg responds to its journey", says Shuman.

The striking iceberg isn't the only perfectly shaped formation scientists came across on their flight over the Atlantic last week, with NASA also sharing images online of a triangular berg found in the Weddell Sea.

The size was hard to guess, Ms Brunt said, but suggested it was likely more than a mile long.

"What makes this one a bit unusual is that it looks nearly like a square", Brunt said, adding that it's probably not very old since wind and water have yet to soften its sharp edges.

Sea ice comes in many types and forms, depending on the stage of development and the meteorological, atmospheric, and other physical conditions.