Nadia raised her hand even though her answer was just continuing with what others have said, "Either iceberg B15A, with an area of 3000 km², is supposedlythe largest iceberg on Earth, or...

"Well, the Antarctic Ice Sheet — a 2-mile-thick ice-layed land larger than Australia, covers an area of almost 14 million km² and contains 30 million km³ of ice. However, most East Antarctica the ice sheet rests on a major land mass, but in West Antarctica (3.2 million km2 of ice) the bed is in places more than 2500 m below sea level. It would be seabed if the ice sheet were not there. Hence, why it might be considered an iceberg."

Nadia dropped her hand. OK, this was most definitely wrong but only so not to give the answer everyone else have given...