McNamara Island is a mainly ice-covered island

Island

An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, cays or keys. An island in a river or lake may be called an eyot , or holm...

, 6 nautical miles (11 km) long, which is partly within the north edge of Abbot Ice Shelf

Abbot Ice Shelf

The Abbot Ice Shelf is an ice shelf long and wide, bordering Eights Coast from Cape Waite to Phrogner Point in Antarctica. Thurston Island lies along the northern edge of the western half of this ice shelf; other sizable islands lie partly or wholly within this shelf.The ice shelf was sighted by...

, about 20 nautical miles (37 km) east of Dustin Island

Dustin Island

Dustin Island is an island about 29 km long, lying 24 km southeast of Cape Annawan, Thurston Island. The feature forms the SE limit of Seraph Bay....

. Discovered by R. Admiral Byrd and members of the United States Antarctic Service (USAS) on flights from the Bear, February 27, 1940. Named by Byrd for John McNamara, boatswain on the Jacob Ruppert

Jacob Ruppert

Jacob Ruppert, Jr. , sometimes referred to as Jake Ruppert, was a National Guard colonel; a U.S. Representative from New York; and brewery owner, who went on to own the New York Yankees...

 of the Byrd Antarctic Expedition, 1933-35.