NASA has discovered an incredible mile-long, perfectly rectangular iceberg floating in the Antarctic.

They shared a striking image of the giant block, known as a tabular berg, after it was captured off the east coast of the Antarctic Peninsula, near the Larsen C ice shelf.

Experts reckon the iceberg’s “sharp angles and flat surface indicate that it probably recently calved from the ice shelf.”

NASA also shared a picture of a perfectly triangular block of ice found nearby and taken on the same trip, Operation Icebridge.

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