Dean Island is an ice-covered island, 20 miles long and 10 miles wide, lying within the Getz Ice Shelf

Getz Ice Shelf

Getz Ice Shelf is an Antarctic ice shelf, over 480 km long and from 32 to 96 km wide, bordering the Hobbs and Bakutis Coasts of Marie Byrd Land between McDonald Heights and Martin Peninsula. Several large islands are partially or wholly embedded in the ice shelf.The ice shelf westward of Siple...

 and midway between Grant Island

Grant Island

Grant Island is an ice-covered island, long and wide, lying east of the smaller Shepard Island off the coast of Marie Byrd Land. Grant Island is located at . Like Shepard Island, Grant Island is surrounded by the Getz Ice Shelf on all but the north side. Grant Island was discovered and charted...

 and Siple Island

Siple Island

Siple Island is a long snow-covered island lying east of Wrigley Gulf along the Getz Ice Shelf off Bakutis Coast of Marie Byrd Land, Antarctica...

, off the coast of Marie Byrd Land

Marie Byrd Land

Marie Byrd Land is the portion of West Antarctica lying east of the Ross Ice Shelf and the Ross Sea and south of the Pacific Ocean, extending eastward approximately to a line between the head of the Ross Ice Shelf and Eights Coast. It stretches between 158°W and 103°24'W...

 which is unclaimed territory in Antarctica. First sighted from a distance of 20 mi from the USS Glacier

USS Glacier

USS Glacier may refer to:, launched as SS Port Chalmers 22.7.1891; purchased, commissioned, renamed Delmonico in 1898 and then Glacier in the same year ; decommissioned and sold in 1922...

 on Feb. 5, 1962. Named for Chief Warrant Officer S.L. Dean, U.S. Navy (USN), Electrical Officer on the Glacier at the time of discovery.