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Hemphill Island (66°23′S 110°34′E / 66.383°S 110.567°E) is a small, mainly ice-covered Antarctic island lying between Robinson Ridge and Odbert Island, in the Windmill Islands. It was first mapped from air photos taken by USN Operation Highjump and Operation Windmill in 1947 and 1948. It was named by the US-ACAN for George R. Hemphill, meteorologist and member of the Wilkes Station party of 1961.