Cape Sharbonneau is a rounded, snow-covered headland

Headland

A headland is a point of land, usually high and often with a sheer drop, that extends out into a body of water.Headland can also refer to:*Headlands and bays*headLand, an Australian television series...

 forming the south side of the entrance to Lehrke Inlet

Lehrke Inlet

Lehrke Inlet is an ice-filled inlet, 8 nautical miles wide, which recedes southwest for 17 nautical miles between Cape Boggs and Cape Sharbonneau, along the east coast of Palmer Land. Discovered by members of the United States Antarctic Service who explored this coast on land and from the air...

, on the east coast of Palmer Land

Palmer Land

Palmer Land is that portion of the Antarctic Peninsula which lies south of a line joining Cape Jeremy and Cape Agassiz. This application of Palmer Land is consistent with the 1964 agreement between US-ACAN and UK-APC, in which the name Antarctic Peninsula was approved for the major peninsula of...

. Members of the East Base of the United States Antarctic Service (USAS) explored this coast in 1940. They charted this feature as an 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...

 which they named for Charles W. Sharbonneau, carpenter at East Base. It was determined to be a cape of Palmer Land in 1947 by a joint sledge party consisting of members of 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:...

 (RARE) and the Falkland Islands Dependencies Survey (FIDS).