But added flame unto his former fire, That wel-nigh molt his hart in raging yre: Ne thenceforth his approved skill, to ward, Or strike, or hurtle rownd in warlike gyre,
The ice pack north of Prudhoe Bay drifts clockwise with the movement of the Beaufort Sea Gyre. Ice islands, large icebergs which originate from the northern coast of Ellesmere Island, can also be found drifting within the gyre. These ice islands may be 150 feet thick. Ice islands in this gyre may remain there for decades before leaving the Arctic Ocean.