What is the world's largest glacier?

The world’s largest glacier is Lambert Glacier in East Antarctica. It is an enormous ice stream about 435 kilometers long, up to 96 kilometers wide, and roughly 2,500 meters deep in places.

Lambert Glacier drains approximately 8% of the Antarctic ice sheet. It flows northward through the Lambert Graben, a major geological depression, and feeds the Amery Ice Shelf at Prydz Bay. Unlike many famous alpine glaciers, it is not a narrow river of ice descending between mountain peaks; it is a vast Antarctic ice stream embedded within the continental ice sheet.

The glacier was first delineated from aerial photography after Operation Highjump in 1946–47. It was later mapped by Australian Antarctic researchers and named for Bruce P. Lambert, an Australian national-mapping official. Fisher Glacier is one of its major tributaries. A common confusion is Jakobshavn Glacier, which is among Greenland’s fastest-moving glaciers and a major producer of icebergs, but it is not the world’s largest glacier by overall dimensions.