Mossman Peninsula is a narrow 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"....

 3 nautical miles (6 km) long, extending south from the west part of Laurie Island

Laurie Island

Laurie Island is an island in the Antarctic Circle, the second largest of the South Orkney Islands. The island is claimed by both Argentina as part of Argentine Antarctica, and the United Kingdom as part of the British Antarctic Territory...

 and separating Scotia and Wilton Bays, in the South Orkney Islands

South Orkney Islands

The South Orkney Islands are a group of islands in the Southern Ocean, about north-east of the tip of the Antarctic Peninsula. They have a total area of about ....

. Discovered in 1821 by Captain George Powell and Captain Nathaniel Palmer

Nathaniel Palmer

Nathaniel Brown Palmer was an American seal hunter, explorer, sailing captain, and ship designer. He was born in Stonington, Connecticut.-Sealing career and Antarctic exploration:...

, and roughly charted on Powell's map of 1822. Surveyed in 1903 by the Scottish National Antarctic Expedition

Scottish National Antarctic Expedition

The Scottish National Antarctic Expedition , 1902–04, was organised and led by William Speirs Bruce, a natural scientist and former medical student from the University of Edinburgh. Although overshadowed in prestige terms by Robert Falcon Scott's concurrent Discovery Expedition, the SNAE completed...

 under Bruce, who named it for Robert C. Mossman, meteorologist of the expedition.