Native name: <span class="nickname" ">Otcho

Map of Bioko

Bioko (Equatorial Guinea)

Location Gulf of Guinea
Coordinates 3°30′N 8°42′E / 3.500°N 8.700°E / 3.500; 8.700Coordinates: 3°30′N 8°42′E / 3.500°N 8.700°E / 3.500; 8.700
Area 2,017 km2 (779 sq mi)
Length 70 km (43 mi)
Width 32 km (19.9 mi)
Highest elevation 3,012 m (9,882 ft)
Highest point Pico Basile
Equatorial Guinea
Population 334,463 (2015 Census (preliminary))
Pop. density 165.8 /km2 (429.4 /sq mi)
Ethnic groups Bubi (58%), Fang (16%), Fernandino (12%), Igbo (7%) (2002)[1]
View of Bioko from satellite
Relief Map

Bioko (also spelled Bioco, in Europe traditionally called Fernando Pó from the period of Portuguese colonization) is an island 32 km off the west coast of Africa, and the northernmost part of Equatorial Guinea. Its population was 334,463 at the 2015 Census[2] (preliminary results) and it covers an area of 2,017 km2 (779 sq mi). The island is located off Cameroon, in the Bight of Bonny portion of the Gulf of Guinea. Its geology is volcanic; its highest peak is Pico Basile at 3,012 m (9,882 ft).


Bioko has a total area of 2,017 km2 (779 sq mi). It is 70 km long from NNE to SSW and about 32 km across. It is volcanic and very mountainous with the highest peak Pico Basile (3,012 m (9,882 ft)). It thus resembles neighbouring islands São Tomé and Príncipe. Like them, it lies on the Cameroon line.

Bioko used to be the end of a peninsula attached to the mainland in what is now Cameroon, but it was cut off when sea levels rose 10,000 years ago at the end of the last ice age.[3]


The island has a population of 334,463 inhabitants (2015 Census).[4] Its historic indigenous tribe was Bubi people, but they have long since become a minority, outnumbered by workers imported from Río Muni, Nigeria, Liberia and Cameroon. The rest of the population are Fernandinos, Spaniards, and immigrants.


Bioko's native name is Otcho in the Bube language.

The Portuguese navigator Fernão do Pó in 1472 named it Formosa Flora ('Beautiful Flower'), but in 1494 the Portuguese renamed it Fernão do Pó in his honor.


The island was inhabited in the middle of the first millennium BC by Bantu tribes from the mainland, who formed the Bubi ethnic group. Unlike other islands in the area, Bioko had an indigenous African population. The Bubi speak a Bantu language. The island has probably been inhabited by this or other Bantu-speaking groups since before the 7th century BC.

In 1472, the Portuguese navigator Fernão do Pó was the first European to "visit" the island. He named it Formosa Flora ('Beautiful Flower'). In 1494 it was renamed Fernando Pó in his honor after being claimed as a colony by the Portuguese. The Portuguese developed the island for sugarcane crops, and while considered poor quality, the refineries' output was such that Fernando Po sugar briefly dominated the trade centres in Europe.

In 1642, the Dutch East India Company established trade bases on the island without Portuguese consent. It temporarily centralized from there its slave trade in the Gulf of Guinea. The Portuguese appeared again on the island in 1648, replacing the Dutch Company with one of their own, also dedicated to slave trading and established in its neighbour island Corisco.

Parallel with this establishment, the Bubi clans began the slow process of establishing the core of a new kingdom on the island, especially after the activity of some local chiefs such as Molambo (approx. 1700–1760). During a period when enslavement was increasing in the region, local clans abandoned their coastal settlements and settled in the safer hinterland.

Bioko in the distance from Limbe, Cameroon

Under the 1778 Treaty of El Pardo, Portugal ceded Fernando Po, Annobón, and the Guinea coast, Rio Muni, to Spain, together forming modern Equatorial Guinea. The treaty was signed by Queen Mary I of Portugal and King Charles III of Spain, in exchange for territory on the American continent. Spain mounted an expedition to Fernando Po, led by the Conde de Argelejos, who stayed for four months. In October 1778, Spain installed a governor on the island who stayed until 1780, when the Spanish mission left the island.

Chief Molambo was succeeded by another local leader, Lorite (1760–1810), who was succeeded by Lopoa (1810–1842). After abolishing the British Atlantic slave trade, from 1827 to 1843 the British leased bases at Port Clarence (modern Malabo) and San Carlos for anti-slavery patrols. The settlement at Port Clarence (named after the Duke of Clarence) was constructed under the supervision of William Fitzwilliam Owen. He had previously mapped most of the coasts of Africa and was a zealous anti-slaver. During his three-year command, his forces detained 20 ships and liberated 2,500 slaves. The Court of Mixed Commission was moved from Freetown, Sierra Leone to Clarence to hasten the legal process of emancipating slaves liberated from slave ships.[5]

In March 1843, Juan José Lerena planted the Spanish flag in Malabo, starting the decline of British influence on the island. Spain revoked the British lease in 1855.[6] Madabita (1842–1860) and Sepoko (1860–1875) were principal local chiefs during the period when Spain re-established its control of the island. This period was also marked by Spain's transport deportation here of several hundred Afro-Cubans, as well as tens of Spanish scholars and politicians considered politically undesirable. In addition Spain exiled 218 rebels here from Philippine Revolution, of whom only 94 survived for long.[7]:539

In 1923–1930, the League of Nations investigated the transportation of contract migrant labour between Liberia and the Spanish colony of Fernando Po. Although the League concentrated its attention on arrangements in Liberia, a closer examination revealed that labour abuse arose from conditions on Fernando Po. In the last quarter of the 19th century, Krio planters on the island had shifted from palm oil trading to cocoa cultivation. Their dependence on migrant labour and increasing competition with Europeans resulted in an economic crisis in the first years of the twentieth century. Planters detained labour but failed to pay their contracts, resulting in a situation of de facto slavery. Liberia prohibited labor traders from contracting with their citizens.

During the Nigerian civil war in the 20th century, relief agencies used the island as a base for flights into Biafra.


Given the numerous ethnic groups and peoples who operated on Bioko, a creole language developed, known as Pichi. It is based on English grammar, from the period when the British operated bases for their forces. It also incorporates West African languages from Nigeria and Liberia, as well as the Krio language that had developed in Sierra Leone. Workers came from all these areas in the 19th through much of the 20th century.

Spanish has been an official language since 1844, when Spain took control of the island. It is still the language of education and administration, related to the more than 100 years as a Spanish colony. 67.6% of Equatorial Guineans can speak Spanish, especially those living in the capital, Malabo, on Bioko.[8]


Coastline of Bioko

Malabo is the capital city of Equatorial Guinea and the largest city on the island. The island is mostly covered by tropical rainforest.

Located on Punta Europa, west of Malabo, the Alba Gas Plant processes natural gas delivered from offshore production wells. The plant is operated by Marathon Oil Company through its subsidiary, Marathon Equatorial Guinea Production Limited (MEGPL). The plant produces natural gas liquids (NGL) including propane, butane, and condensate products. The majority of the residue gas from the Alba plant is delivered to a natural gas liquefaction plant operated by EG LNG. A portion of the Alba plant residue is also delivered to the Atlantic Methanol Production Company (AMPCO) and is used to produce methanol. The products from all three plants are loaded onto ocean-going tanker ships for export.


A rectangular transport route links the four main cities: Malabo, Luba, Baney, and Riaba. The airport is Malabo International Airport.

In popular culture

See also


  1. Minahan, James (2002). Encyclopedia of the Stateless Nations: A-C. Greenwood Publishing Group. p. 330. ISBN 0313321094.
  2. Census 2015, DGECN, Equatorial Guinea.
  3. McNeil Jr, Donald G. (16 September 2010). "Precursor to H.I.V. Was in Monkeys for Millenniums, Study Says". The New York Times.
  4. "Bioko". Encyclopedia Britannica. Retrieved 28 April 2015.
  5. Jordan Goodman, "The Hell-Borne Traffic", Geographical, September 2007
  6. "British Empire: Africa: Fernando Po". Retrieved 28 April 2015.
  7. Foreman, J., 1906, The Philippine Islands, A Political, Geographical, Ethnographical, Social and Commercial History of the Philippine Archipelago, New York: Charles Scribner's Sons
  8. Obiang convierte al portugués en tercer idioma oficial para entrar en la Comunidad lusófona de Naciones, Terra. 13 July 2007

External links

Wikimedia Commons has media related to Bioko.
Wikivoyage has a travel guide for Bioko.
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