Hallett Peninsula is a triangular, dome-shaped 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"....

, 20 nautical miles (37 km) long, with 1,500 m cliffs on its E. seaboard side and 300 m on its west side. The peninsula extends from Cape Hallett

Cape Hallett

Cape Hallett is a snow-free area on the northern tip of the Hallett Peninsula on the Ross Sea coast of Victoria Land, East Antarctica. A very large Adelie penguin rookery is located at Cape Hallett...

 to Cape Wheatstone

Cape Wheatstone

Cape Wheatstone is a bold rock cape that forms the south end of Hallett Peninsula and marks the north entrance to Tucker Inlet, Victoria Land. Discovered in January 1841 by Sir James Clark Ross who named it for Sir Charles Wheatstone, English physicist and inventor....

 and is joined to the mainland by a narrow ridge between Tucker Glacier

Tucker Glacier

Tucker Glacier is a major valley glacier of Victoria Land, about 144 km long, flowing southeast between Admiralty Mountains and Victory Mountains to the Ross Sea...

 and Edisto Inlet

Edisto Inlet

Edisto Inlet is a rectangular arm of Moubray Bay, 7 nautical miles long and 3 nautical miles wide, entered between Cape Hallett and Cape Christie. The USS this branch of Moubray Bay in February 1956, and the name Edisto Bay was given at that time. Edisto Inlet has overtaken the earlier name in...

. So named by the New Zealand Geological Survey Antarctic Expedition

New Zealand Geological Survey Antarctic Expedition

The New Zealand Geological Survey Antarctic Expedition describes a series of scientific explorations of the continent Antarctica. The expeditions were notably active in 1957-58 and again in 1958-59. The 1957-58 expedition went to the Ross Dependency and named the Borchgrevink Glacier...

 (NZGSAE), 1957–58, because Hallett station on Seabee Hook

Seabee Hook

Seabee Hook is a low, recurved spit composed of coarse volcanic ash which projects about 0.5 nautical miles west from the high rocky ridge forming Cape Hallett, along the coast of Victoria Land. In January 1956, members of U.S...

was established at the north end of the peninsula.