Parameter Tree:
EARTH SCIENCE > OCEANS > SEA ICE > ICE FLOES

Definition:
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.


Reference:
Canadian Ice Service - Environment Canada
http://www.cis.ec.gc.ca/manice/chp1_eng.htm