South Georgia is an island in the South Atlantic Ocean that is part of the British Overseas Territory of South Georgia and the South Sandwich Islands. It lies around 1,400 kilometres (870 mi) east of the Falkland Islands. Stretching in the east–west direction, South Georgia is around 170 kilometres (106 mi) long and has a maximum width of 35 kilometres (22 mi). The terrain is mountainous, with the central ridge rising to 2,935 metres (9,629 ft) at Mount Paget. The northern coast is indented with numerous bays and fjords, serving as harbours.

Discovered by Europeans in 1675, South Georgia had no indigenous population due to its harsh climate and remoteness. Captain James Cook in HMS Resolution made the first landing, survey and mapping of the island. On 17 January 1775, Cook claimed it a British possession, naming it "Isle of Georgia" after King George III. Through its history, it served as a whaling and seal hunting base, with intermittent population scattered in several whaling bases, the most important historically being Grytviken. The main settlement and the capital today is King Edward Point near Grytviken, a British Antarctic Survey research station, with a population of about 20 people.

The island of South Georgia was probably discovered in 1675 by Anthony de la Roché, a London merchant, and was named Roche Island on a number of early maps. It was sighted by a commercial Spanish ship named León operating out of Saint-Malo on 28 or 29 June 1756. According to Argentine historians, it was explored on 29 June 1756, St Peter's Day, hence its Spanish name Isla San Pedro, literally 'St Peter's Island'.

The mariner Captain James Cook in HMS Resolution made the first landing, survey and mapping of South Georgia. As mandated by the Admiralty, on 17 January 1775 he took possession for Britain and renamed the island 'Isle of Georgia' for King George III.

After making a foot crossing of the island with Tom Crean and Frank Worsley, Ernest Shackleton organised the rescue of his party from Elephant Island following the disaster that befell the 1916 Imperial Trans-Antarctic Expedition, which he led. He is buried in the cemetery at Grytviken alongside Frank Wild.

Commercial sealing was conducted on the island between 1786 and 1913. During that period 131 sealing visits are recorded, eight of which ended when the vessel was wrecked. Modern industrial sealing associated with whaling stations was carried out between 1909 and 1964. Sealing era relics include iron try pots, hut ruins, graves and inscriptions. The South Georgia Museum was established on the island in 1992.

The island was surveyed by explorer Duncan Carse. He organised and led the South Georgia Survey of 1951–1957, surveying much of the interior of the island. Mount Carse and Carse Point are named after him. In 1961 he lived as a hermit in a remote part of South Georgia. Carse built a house at Ducloz Head on the southern coast of the island, intending to live there through the winter. However, in May, three months into the experiment, surge waves destroyed his camp. He managed to salvage enough gear to survive the winter until making contact with a ship 116 days later.

His knowledge and mapping proved helpful to the British during the Falklands conflicts.^{[citation needed]}