Sierra Island is a narrow island which is marked by a series of small elevations throughout its length, lying 0.5 miles northwest of Dee Island and north of Greenwich Island in the South Shetland Islands, Antarctica. Surface area 14 hectares.Named by the 5th Chilean Antarctic Expedition, 1950–51, after Sgt. Victor Sierra, sick-bay attendant of the patrol ship Lientur on the expedition.
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Coordinates -62°24'22.962" N -59°48'27.317" E
