Powell Island is a narrow island 7 miles long and 2 miles wide, lying between Coronation and Laurie Islands in the central part of the South Orkney Islands. Discovered on the occasion of the joint cruise by Capt. George Powell and Capt. Nathaniel Palmer in December 1821. It was correctly charted, though unnamed, on Powell's map published in 1822. Named for Captain Powell on an Admiralty chart of 1839.