pack ice

mass of floating ice formed over a period of many years

Drift ice consists of sea ice that floats on the surface of the water in cold regions, as opposed to fast ice, which is attached ("fastened") to a shore. Usually drift ice is carried along by winds and  sea currents, hence its name, "drift ice". When the drift ice is driven together into a large single mass, it is called pack ice. Typically areas of pack ice are identified by high percentage of surface coverage by ice: e.g., 80-100%.An ice floe is a large piece of drift ice that might range from tens-of-yards to several miles in diameter. Wider chunks of ice are called ice fields.
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Noun
1. a large expanse of floating ice
(synonym) Ice pack
(hypernym) ice

pack-ice /'pækais/
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