Clipperton Island 🏳

On 24 January 1521 the Portuguese-born Spanish explorer recorded an island named San Pablo after turning west from the American mainland. It is considered a possible first sighting of Clipperton and later underpinned Spanish-derived Mexican claims to the atoll.

On 15 November 1528 the Spanish navigator, sailing for his cousin Hernán Cortés in search of a route to the Philippines, recorded an island in the region. Spanish records of 1528 were later cited by Mexico as the documentary basis of its sovereignty claim.

The isolated atoll was named for John Clipperton, an English pirate rumoured to have made it his hideout early in the eighteenth century.

The French merchant captain of La Découverte reached the island on Good Friday, 3 April 1711, joined next day by Martin de Chassiron in La Princesse. They drew the first map and named it Île de la Passion, establishing the French claim of priority that would prevail in arbitration two centuries later.

Following independence in 1821 Mexico assumed possession of territories formerly held by Spain, and because Spanish records noted the island as early as 1528 it was treated as Mexican. This inheritance framed the long sovereignty dispute with France.

The American sea captain explored the atoll and produced a detailed report of its vegetation, sea turtles, seals and vast seabird colonies. His account remains the baseline against which later ecological change on Clipperton is measured.

France annexed the island in 1855, though it was also claimed by the United States under guano legislation.

Rouher reached an arrangement with a Mr Lockhard of Le Havre to claim oceanic islands in the Pacific for the exploitation of guano deposits. The deal set in motion the formal French annexation of Clipperton later that year.

On 17 November 1858 France annexed the island, and Lieutenant Victor Le Coat de Kervéguen published notice of the annexation in Hawaiian newspapers to publicise the claim. This act of state became the decisive evidence of French title in the 1931 arbitration.

The San Francisco businessman lodged a claim with the US State Department in 1892, transferring the rights in 1893 to the Oceanic Phosphate Company. The State Department rejected the claim, citing France's prior claim and the absence of the required bond, yet mining proceeded regardless.

Charles Jensen and 'Brick' Thurman were landed with ninety days' supplies to deter rival claimants, and survived partly on seabirds' eggs before the schooner Viking retrieved them, returning to San Francisco on 31 October. The episode illustrated the commercial stakes attached to an otherwise barren atoll.

From 1895 the company worked the deposits with a peak of 25 men, shipping guano to Honolulu and San Francisco at US$10–20 per ton. The operation drew French and Mexican official attention and precipitated the confrontations of 1897.

On 24 November 1897 the French found three Americans working the island and had their flag struck; US authorities assured Paris they claimed no sovereignty. The incident marked France's reassertion of physical control over its 1858 claim.

On 13 December 1897 Mexican marines expelled the guano workers and hoisted the Mexican flag, prompting a French protest. The action opened the formal phase of the Franco-Mexican sovereignty dispute.

From 1898 to 1905 the British firm exploited Clipperton under agreement with Mexico, while Mexico pressed a US$1.5 million claim against the Oceanic Phosphate Company for guano shipped between 1895 and 1897. Commercial dependence on Mexican licensing reinforced Mexico's effective occupation.

Mexico renegotiated its concession in 1905, garrisoning the island the following year and building a lighthouse; Captain Ramón Arnaud, chosen for his English and French, was appointed governor. The colony was intended to secure Mexican sovereignty against the French claim.

On 2 March 1909, after lengthy diplomatic correspondence, both states agreed to accept the determination of the King of Italy on ownership of Clipperton. The commitment converted a colonial standoff into a landmark case of international law.

By 1914 around 100 men, women and children lived on Clipperton, provisioned every two months from Acapulco, but fighting on the mainland ended regular visits. Isolation led directly to the colony's collapse from scurvy and violence.

On 28 February 1914 the schooner was lost on the reef; four crewmen rowed a lifeboat to Acapulco and the USS Cleveland later rescued the rest. Governor Arnaud declined the American offer to evacuate his colonists, expecting a supply ship.

The constitution explicitly listed La Pasión as Mexican territory, entrenching the claim in fundamental law. The provision was amended on 18 January 1934 after the sovereignty dispute was settled in France's favour.

By 1917 scurvy and a failed boat voyage had killed all the men but lighthouse keeper Victoriano Álvarez, who declared himself king and terrorised the surviving women until Tirza Rendón killed him. Four women and seven children were taken off on 18 July 1917, and Clipperton was abandoned.

As flying boats opened the Pacific, the island was assessed as a staging point on a route from the Americas to Asia via the Marquesas, bypassing Hawaii. The prospect gave the barren atoll strategic value in commercial and military air planning.

Arbitration by King Victor Emmanuel III of Italy ruled in the Clipperton Island Case that the atoll was a French possession. President Pascual Ortiz Rubio consulted international experts amid Mexican claims of bias, but Mexico accepted the finding, and France took formal possession in 1935. The decision settled sovereignty and became a standard authority on effective occupation in international law.

On 26 January 1935 French authorities enacted the transfer confirmed by the 1931 arbitration. Formal possession completed France's title to its only North Pacific territory.

Roosevelt fished for sharks while Dr Waldo L. Schmitt went ashore to collect specimens; of 190 collected, twenty species were identified and nine found only at Clipperton, one sponge named Callyspongia roosevelti. An earlier attempt in July 1934 had been thwarted by heavy seas.

At their meeting the two presidents raised Mexican ownership, with Washington interested because of the island's value for air travel and its proximity to the Panama Canal. The talks lapsed, as Mexico had already accepted the 1931 award and the US judged a base easier to obtain from France.

USS Argus sailed from San Francisco on 4 December 1944 with aerological personnel, followed by LST-563, which grounded on the reef on 21 December along with the salvage ship USS Seize before both were freed in January 1945. Twenty-four armed sailors released daily weather balloons, and Clipperton was also considered for an airfield linking North America and Australia.

Paris sent a formal note defending French sovereignty; Foreign Minister Georges Bidault called the affair humiliating and French officials tried covertly to charter Mexican vessels to reach the atoll, only to be blocked at American request. Washington offered French operation of the station and, in February 1945, flew Lieutenant Louis Jampierre out to inspect it.

Withdrawal began in September 1945 and the last personnel left by 21 October, destroying munitions but leaving substantial matériel behind. Clipperton reverted to uninhabited French territory, its abandoned huts and debris used by later castaways and expeditions.

Men from San Pedro, California, survived on the deserted island before being taken off. Such incidents underlined the hazards of the reef and the absence of any permanent presence after 1945.

The Los Angeles County Museum ornithologist found brown and masked booby colonies reduced to 500 and 150 birds and eradicated the pigs introduced by guano miners in the 1890s. By 2003 the colonies had reached 25,000 brown and 112,000 masked boobies, the world's largest masked booby colony, and the story inspired the founding of the non-profit Island Conservation in 1994.

The frigate Germinal supported a clean-up of the island's beaches, also recovering a bale of cocaine. The mission combined environmental work with a demonstration of French sovereign presence.

Parliament passed legislation in 2022 formally designating the island by its dual French and common name. The measure asserted French identity over the territory alongside administrative reforms.

Five colonies of the fire coral were located at depths of 28–32 m, the first known in the region. Clipperton's reefs host over 115 identified species with one of the highest concentrations of endemism anywhere.

In 2018 France extended the territorial sea to 22 km and the exclusive economic zone to 370 km, enclosing 431,273 square kilometres of ocean. The uninhabited atoll thus underwrites one of the largest maritime jurisdictions in the Pacific.

Participants in a 2015 scientific and amateur radio expedition discovered the drugs on the atoll. Similar finds, including a bale recovered in 2023, indicate Clipperton's position on eastern Pacific trafficking routes.

Folliot landed on the atoll in 2015, drawing parliamentary attention to the neglected territory. The visit came during a period of renewed French interest in the island's resources and surveillance.

The mission identified seabed nodules within France's exclusive economic zone, and radio operator Alain Duchauchoy worked from the island as TX5P while researching early Mexican occupation. The find pointed to potential mineral value in the vast zone Clipperton generates.

Twenty-four operators using callsign TX5K made over 114,000 radio contacts, beating the previous record of 75,000, including moonbounce work on the 6-metre band and the DXA real-time online log. Scientific work included the first collection of foraminifera at Clipperton and kite-borne aerial imaging.

The 2012 crew recorded heavy accumulations of rubbish, especially on the north-east shore and around Clipperton Rock. Debris also remained from the American occupation of 1944–45, the French missions of 1966–69 and a 2008 expedition.

On the night of 10 February 2010 the 170 m ship grounded en route from the Panama Canal to South Korea with 10,513 tonnes of xylene, 6,005 tonnes of soybean oil and 6,000 tonnes of tallow. The wreck highlighted the pollution risk posed by shipping around the unpatrolled atoll.

The Californian fish dealer collected 52 protected angelfish and misdeclared them to US wildlife authorities, intending to sell them for $10,000. On 15 December 2011 he was sentenced to 45 days' incarceration, a year's probation and a $2,000 fine.

The expedition took cores from the meromictic lagoon to study climate change over the past millennium. The lagoon's closed, stratified character makes it an unusual palaeoclimate archive.

On 21 February 2007 responsibility passed from the High Commissioner of the Republic in French Polynesia to the Overseas Ministry. The change consolidated direct metropolitan control over the territory.

The 2007 treaty, reaffirmed in 2017, allows Mexican vessels to fish subject to French authorisation, conservation rules and catch reporting. Infrequent French patrols make compliance hard to verify, and illegal fishing, lobster harvesting and shark finning persist.

The four-month scientific mission catalogued mineral, plant and animal species, studied algae to 100 m depth and assessed pollution, and French scientists identified three dinoflagellate microalgae in the lagoon, one unique to the island. The work made Clipperton one of the better-documented remote atolls.

The French mission extended the 1997 studies to examine the evolution of Clipperton's ecosystem, counting only 674 surviving palms. A geodetic marker was also placed to determine whether the land is rising or sinking.

Rats probably arrived when large fishing boats wrecked in 1999 and 2000. A 2005 NOAA Southwest Fisheries Science Center report linked their spread to declining crab and bird numbers and a corresponding increase in vegetation and coconut palms.

The atoll lay in the path of the developing Hurricane Felicia in 1997, Tropical Storm Andres in 2003 and Hurricane Sandra in 2015. Recurrent storms, heavy rainfall of 3,000–5,000 mm a year and a hazardous reef constrain any permanent occupation.

The joint Mexican–New Caledonian mission carried out extensive studies of the atoll and its waters. It established the modern scientific baseline extended by later French expeditions.

Requested in November 1994, the mission spent a month installing and calibrating radar to monitor first-stage breakup on flight V88. The effort was wasted when the rocket disintegrated 37 seconds after launch owing to a software bug.

The Company for the Study, Development and Exploitation of Clipperton Island outlined a fishing port scheme, but economic constraints, distance from markets and the atoll's small size limited work to preliminary studies. Parallel mid-1980s efforts to settle French Polynesians on the island were also dropped.

Following the Académie des sciences d'outre-mer's recommendation for an airstrip and lagoon fishing port, the island was reassigned from the High Commissioner for French Polynesia to the Overseas Minister. Clipperton was classified as overseas state private property administered directly by Paris.

The installation, finished on 7 April 1980, relayed data through the Argos satellite system to the Lannion Space Meteorology Centre in Brittany. It restored a permanent meteorological function to the uninhabited island.

Cousteau visited with divers and a survivor of the 1917 evacuation to make a television special. The film brought international attention to the atoll's history and ecology.

The EEZ declared in 1976 gave France jurisdiction over the rich waters surrounding the atoll. It was reaffirmed after France ratified the UN Convention on the Law of the Sea in 1996.

Plans to cut a passage through the atoll rim to create a trade and tourism harbour were studied and then abandoned. The episode began a sequence of failed development schemes for the atoll.

Successive missions landed some 25 tons of equipment including Polynesian-style dwellings, water treatment tanks and generators, and surveyed the island, its waters, weather and the wartime airstrip. The installations were derelict by 1978, but the missions asserted an active French presence.

Nine crewmen lived on Clipperton from 6 February to 1 March 1962, sheltering in cement bags and tin salvaged from wartime Quonset huts and drinking lagoon water, which they reported potable. They were spotted by a fishing boat and taken off by the destroyer USS Robison.

With independence in 1962 threatening French testing grounds in North Africa, the atoll was examined as a replacement but ruled out for its hostile climate and remoteness. It was instead used for a small scientific mission collecting nuclear fallout data from other tests.

Sachet found sparse spiny grass, low thickets, creeping Ipomoea and stands of coconut palm, contrasting with reports of 1711, 1825 and 1839 and with Snodgrass and Heller's 1898 claim that no land plant was native. Her survey documented the transformation wrought by introduced palms and pigs.