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Sugarloaf Island is a conspicuous small island which lies close to the east side of Clarence Island, midway between Cape Lloyd and Cape Bowles, in the South Shetland Islands, Antarctica. It lies 3.2 km north of Lebed Point, on the northern side of the entrance to Istros Bay. The name was in use by American and British sealers as early as 1822 and is now well established.