The monolithic slab of ice, floating just off the Larsen C ice shelf appears quite unnatural given the 90-degree angles. Tabular icebergs typically break off of ice shelves, which are tabular bodies of thick ice. The tabular iceberg, which was larger than the island of Jamaica, calved off the Ross Ice Shelf in 2000. Towards the bottom of the map, you will notice the Ross Ice Shelf, which produced the largest iceberg in history. A normal process for these ice shelves is calving, the breaking off of distal ice from the larger ice shelf.

Source: Forbes October 22, 2018 16:30 UTC