Cape Shackleton is a cape in Avannaata municipality in northwestern Greenland. The cape is the western promontory on Apparsuit Island,Upernavik Avannarleq, Saga Map, Tage Schjøtt, 1992 delimiting the northern end of Tasiusaq Bay, an indentation of Baffin Bay in the Upernavik Archipelago.
This headland was known to whalers as "Horse's Head".Clements R. Markham, Life of Admiral Sir Leopold McClintock, p. 82
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