It's taken roughly five months, but a massive iceberg has separated from Antarctica's Pine Island Glacier. According to NASA's Earth Observatory, the estimated size of this iceberg, named B-31, is around 660 square kilometres (33 km long by 20 km wide) – a city-sized block of ice that has slowly migrated away from the continent, and is now floating out to sea. Take a look at some massive icebergs afloat in the oceans. Photo: File photo of an iceberg floating near a harbour in the town of Kulusuk, east Greenland August 1, 2009. (Photo by Bob Strong/Reuters)

People walk along the Neva River at sunset in St.Petersburg, Russia, Tuesday, December 6, 2016. The temperature in St.Petersburg is –9C ( 15.8 °F). (Photo by Dmitri Lovetsky/AP Photo)

In this photo taken on Thursday, March 7, 2019, the sun rises over the star on the spire on top of a Stalin-era skyscraper, now the Radisson Royal Hotel on the banks of the Moskva River in Moscow, Russia. (Photo by Dmitry Serebryakov/AP Photo)

People take pictures of the sun rising next to the buildings of the banking district in Frankfurt, Germany, Saturday, December 28, 2019. (Photo by Michael Probst/AP Photo)

The sunrise at Boscombe beach at Bournemouth in Dorset, southwest United Kingdom on February 23, 2021. (Photo by Steve Hogan/pictureexclusive.com)

The sun rises behind the landmark Anchor on the quay in Appledore, North Devon, United Kingdom on June 7, 2022. The anchor has been decorated with hundreds of colourful crocheted flowers by the residents of the North Devon coastal village. (Photo by Terry Mathews/Alamy Live News)

A giraffe was captured creating a dust cloud while running in front of a perfect African sunset in Amboseli National Park, Kenya in the first decade of November 2022. (Photo by Edgard Berben/Media Drum Images)

The tusk of a woolly mammoth that lived some 18,000 years ago, from which researchers sequenced the extinct mammal's entire genome, is seen in northeastern Siberia in this photo from 2015. (Photo by Love Dalen/Handout via Reuters)