ice sheet A mass of glacier ice that covers surrounding terrain and is greater than 50,000 km2. Arctic pack ENVO ENVO:00000132 ENVO:00000379 FTT:758 FTT:835 FTT:837 ICE FIELD SWEETRealm:IceSheet TGN:21147 Wikipedia:Ice_sheet bay ice continental glacier continental ice glacial tongue ice field ice mass island ice pack ice polar ice polar ice pack rock glacier shelf ice glacier