Case Island is a roughly circular ice-covered island, 12 miles (19.3 km) in diameter, lying off the Antarctic coast. The island lies in Carroll Inlet

Carroll Inlet

Carroll Inlet is an inlet, long and wide, trending southeast along the Antarctic coast between the Rydberg Peninsula and Smyley Island. The head of the inlet is divided into two arms by the presence of Case Island and is bounded to the east by Stange Ice Shelf...

 between the mainland and Smyley Island

Smyley Island

Smyley Island is an Antarctic island lying off the Antarctic Peninsula at coordinates .-See also:* Composite Antarctic Gazetteer* List of Antarctic and sub-Antarctic islands* List of Antarctic islands south of 60° S* SCAR...

. It was mapped by the United States Geological Survey

United States Geological Survey

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology,...

 from surveys and from U.S. Navy aerial photographs, 1961–66. The name was suggested by Finn Ronne

Finn Ronne

Finn Ronne was a U.S. Antarctic explorer.-Background:Finn Ronne was born in Horten, in Vestfold county, Norway. His father, Martin Rønne , was a polar explorer and served in Roald Amundsen's successful expedition to the South Pole...

 for Senator Francis H. Case

Francis H. Case

Francis Higbee Case was an American journalist and politician who served for 25 years as a member of the United States Congress from South Dakota. He was a Republican.-Biography:...

, who assisted in obtaining Government support to provide a ship for the Ronne Antarctic Research Expedition

Ronne Antarctic Research Expedition

The Ronne Antarctic Research Expedition was an expedition from 1947-1948 which researched the area surrounding the head of the Weddell Sea in Antarctica.-Background:...

, 1947–48.