Duncan Peninsula is an ice-covered peninsula

Peninsula

A peninsula is a piece of land that is bordered by water on three sides but connected to mainland. In many Germanic and Celtic languages and also in Baltic, Slavic and Hungarian, peninsulas are called "half-islands"....

, 30 nautical miles (60 km) long, which forms the east part of Carney Island

Carney Island

Carney Island is an ice-covered island, long and about in area, with all but its North coast lying within the Getz Ice Shelf, Antarctica. It is located between Siple Island and Wright Island along the coast ofMarie Byrd Land....

, along 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...

. Delineated from aerial photographs taken by U.S. Navy Operation Highjump in January 1947. Named by Advisory Committee on Antarctic Names

Advisory Committee on Antarctic Names

The Advisory Committee on Antarctic Names is an advisory committee of the United States Board on Geographic Names responsible for recommending names for features in Antarctica...

 (US-ACAN) for Admiral Donald B. Duncan, U.S. Navy (Ret.), Vice Chief of Naval Operations under Admiral Carney during the IGY period of 1957-58.