Prime Head is a prominent snow-covered headland which forms the Northern extremity of Antarctic Peninsula. The name Siffrey was given to a cape in this vicinity by the French Antarctic Expedition under Capt. Jules Dumont d'Urville, 1837-40, and was previously approved for the feature here described. D'Urville's "Cap Siffrey" has since been identified by the UK-APC as a point two miles to the ESE, now called Siffrey Point. The name Prime Head, given by the UK-APC in 1963, alludes to the position of the headland as the first or northernmost feature of Antarctic Peninsula.