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floe Any relatively flat piece of sea ice 20 meters or more across. Floes are subdivided according to horizontal extent. A giant floe is over 5.4 nautical miles across; a vast floe is 1.1 to 5.4 nautical miles across; a big floe is 500 to 2000 meters across; a medium floe is 100 to 500 meters across; and a small floe is 20 to 100 meters across.

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