Tristan da Cunha (), colloquially known as Tristan, is a remote group of volcanic islands in the South Atlantic Ocean. It is one of three constituent parts of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, with its own constitution.
The territory consists of the inhabited island Tristan da Cunha, which has a diameter of roughly 11 kilometres (6.8 mi) and an area of 98 square kilometres (38 sq mi); the wildlife reserves of Gough Island and Inaccessible Island; and the smaller, uninhabited Nightingale Islands. As of September 2026, the main island had 222 permanent inhabitants, all of whom hold British Overseas Territories citizenship. The other islands are uninhabited, except for the South African personnel at a weather station on Gough Island.
The island has no airstrip; the only way to travel to or from Tristan is by ship. It is a six-day journey from Cape Town, South Africa, and some cruises depart from Ushuaia, Argentina. The island of Tristan da Cunha is considered to be the most remote inhabited place in the world.
The islands were first recorded as sighted in 1506 by Portuguese explorer Tristão da Cunha, though rough seas prevented a landing. He believed them to be uninhabited and named the main island after himself, Ilha de Tristão da Cunha. It was later anglicised from its earliest mention on British Admiralty charts to Tristan da Cunha Island. Some sources state that the Portuguese made the first landing in 1520, when Lás Rafael, captained by Ruy Vaz Pereira, called at Tristan for water.
The first undisputed landing was made on 7 February 1643 by the crew of the Dutch East India Company ship Heemstede, captained by Claes Gerritsz Bierenbroodspot. The Dutch stopped at the island four more times in the next 25 years, and in 1656 created the first rough charts of the archipelago.
The first full survey of the archipelago was made by the crew of the French corvette L'Heure du Berger (The Shepherd's Hour) in 1767. Measurements were taken and a rough sounding of the coast was carried out. The presence of water at the great waterfall of Big Watron and in a lake on the north coast was noted, with the survey results later published by a Royal Navy hydrographer in 1781.
On his voyage out from Europe to East Africa and India in command of the Imperial Asiatic Company of Trieste and Antwerp ship, Joseph and Theresa, William Bolts sighted Tristan da Cunha, put a landing party ashore on 2 February 1777 and hoisted the flag of the Holy Roman Empire, naming it and its neighbouring islets the Brabant Islands. However, no settlement or facilities were ever set up there by the company.
After the outbreak of the American Revolutionary War halted penal transportation to the Thirteen Colonies, British prisons became overcrowded. As several stopgap measures proved ineffective, the British Government announced in December 1785 that it would proceed with the settlement of New South Wales. In September 1786 Alexander Dalrymple, presumably goaded by Bolts's actions, published a pamphlet with an alternative proposal of his own for settlements on Tristan da Cunha, St. Paul and Amsterdam islands in the Southern Ocean.
Royal Navy Captain John Blankett also suggested independently to his superiors in August 1786 that convicts be used to establish a British settlement on Tristan. In consequence, the Admiralty received orders from the government in October 1789 to examine the island as part of a general survey of the South Atlantic and the coasts of southern Africa. That did not happen, but an investigation of Tristan, Amsterdam and St. Paul was undertaken in December 1792 and January 1793 by George Macartney, Britain's first ambassador to China. During his voyage to China, he established that none of the islands were suitable for settlement.
Later in the same month, the first scientific exploration on the island was conducted by French botanist Louis-Marie Aubert du Petit-Thouars, who stayed on the island for three days during a French mercantile expedition from Brest, France, to Isle de France (Mauritius). Thouars made botanical collections and reported traces of human habitation, including fireplaces and overgrown gardens, probably left by Dutch explorers in the 17th century.
The first permanent settler was Jonathan Lambert of Salem, Massachusetts, United States, who arrived in December 1810 with two other men, later joined by a fourth. Lambert declared the islands his property and named them the Islands of Refreshment. Three of the four men died in 1812, leaving Thomas Currie (Tommaso Corri, from Livorno, Italy) as the sole survivor, who remained as a farmer on the island.
On 14 August 1816, the United Kingdom annexed the islands by dispatching a garrison to secure possession, making them a dependency of the Cape Colony in South Africa. This was intended to prevent the islands' use as a base for any attempt to free Napoleon Bonaparte from his imprisonment on Saint Helena. The occupation also deterred the United States from using Tristan da Cunha as a base for naval cruisers, as it had during the War of 1812. The garrison departed in November 1817, though some members, notably William Glass, stayed and formed the nucleus of a permanent population.
By 1824, a small civilian community had developed alongside the British Marines' garrison. When Berwick stopped there on 25 March 1824, it reported twenty-two men and three women, including the artist Augustus Earle, stranded on the island for eight months when his ship, the aging Duke of Gloucester, anchored there due to a storm and sailed without him and a crew member. Earle tutored local children and painted until his supplies ran out, before being rescued in November by Admiral Cockburn en route to Hobart. The barque South Australia visited between 18 and 20 February 1836, when a Mr. Glass was described as the settlement's governor. That same year, the schooner Emily was wrecked there; one survivor, Dutch fisherman Pieter Groen from Katwijk, remained, married, and changed his name to Peter Green. He later became the spokesman (governor) of the community in 1865. By 1856, the population had grown to 97 residents.
A resident parson arrived in February 1851, and Tristan was formally included in the Anglican Diocese of Cape Town when its bishop, Robert Gray, visited in March 1856. In 1869, it was transferred to the new Diocese of St Helena. In 1867, Prince Alfred, Duke of Edinburgh, second son of Queen Victoria, visited the islands. The only settlement was renamed Edinburgh of the Seven Seas in his honour. On 15 October 1873, the Royal Navy survey vessel HMS Challenger called at Tristan to conduct geographic and zoological surveys on the island group. Captain George Nares recorded fifteen families and eighty-six inhabitants at that time.
In 1875, Henry Herbert, 4th Earl of Carnarvon, as Secretary of State for the Colonies decided against annexing Tristan to the Cape Colony, or making it a colony in its own right, or giving magistrate powers to any resident. Instead, an order in council was drafted under the British Settlements Act 1843 (6 & 7 Vict. c. 13) to give magistrate powers to the officer commanding any Royal Navy vessel while touching at Tristan, with jurisdiction in graver cases reserved to the Cape Colony courts under the West Coast of Africa and Falkland Islands Act 1860 (23 & 24 Vict. c. 121). The Law Officers of the Crown reviewed the draft order and decided that it was valid on the basis that Tristan was part of the British Empire. The government gave £200 to provide "useful presents" for the islanders, including a flag.
Whalers established bases on the islands during the mid-19th century, but the opening of the Suez Canal in 1869 and the transition from sail to coal-fired steamships increased Tristan's isolation. The islands were no longer needed as a stopover point for long sailing voyages or as a haven on routes from Europe to East Asia.
On 27 November 1885, the island suffered one of its worst tragedies when the iron barque West Riding, en route from Bristol to Sydney, approached the island. Because trading opportunities were rare, almost all able-bodied men launched a lifeboat to trade with the ship despite rough seas. The lifeboat, recently donated by the British government, was last seen sailing alongside the West Riding before disappearing. Reports varied—some claimed the men drowned, while others speculated they were taken to Australia and sold as slaves. Fifteen men were lost, leaving behind an island of widows. A plaque in St Mary's Church commemorates the tragedy.