Ice shelf

floating platform of ice on the ocean surface, at outlet of a glacier or ice sheet

An ice shelf is a large platform of ice, where a glacier flows down to a coastline. An ice shelf is usually very thick, usually 100 metres (330 ft) or more. Some ice shelves float on the water. Ice shelves that float are usually much thinner.

Major Ice shelves in Antartica. ROss Ice shelf is red, Fincher Ronne is the large area in blue
Ross Ice Shelf.
Ronne Ice Shelf, in 2017

The biggest areas of ice shelf are in Antarctica:

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