Floe refers to any relatively flat piece of ice 20 m or more across. Floes are subdivided according to horizontal extent: small, medium, big, vast, giant.
An ice floe (/floʊ/) is a large pack of floating ice often defined as a flat piece at least 20 m across at its widest point, and up to more than 10 km across. Drift ice is a floating field of sea ice composed of several ice floes. They may cause ice jams on freshwater rivers, and in the open ocean may damage the hulls of ships.
