Ellefsen Harbour () is a harbour lying at the south end of
Powell Island
Powell Island is a narrow island long and wide, lying between Coronation and Laurie Islands in the central part of the South Orkney Islands of Antarctica. Its southern end lies 7 km east of the south-western extremity of Coronation Islan ...
South Orkney Islands
The South Orkney Islands are a group of islands in the Southern Ocean, about north-east of the tip of the Antarctic PeninsulaGeorge Powell, a British sealer, and Captain
Nathaniel Palmer
Nathaniel Brown Palmer (August 8, 1799June 21, 1877) was an American seal hunter, explorer, sailing captain, and ship designer. He gave his name to Palmer Land, Antarctica, which he explored in 1820 on his sloop ''Hero''. He was born in Stoning ...
, an American sealer, in December 1821. Shortly afterward, it was briefly occupied by Sam Pointer. The name first appeared on Powell's chart published in 1822.