An ice shelf is a type of glacier that does not form in the mountains, but composes a part of the ice sheet margin and descends into the sea. Its part floats on the sea surface, and the base is immersed inwater. The form resembles a table, ending with an ice cliff (glacier terminus).
The largest ice shelves are located in Antarctica — for example, the Ross Ice Shelf in the Ross Sea. In the year 2000 the biggest recorded iceberg, called the B-15, with an area of 11 000 km2 calved from it.