Geographys

Zanzibar

Islands off East Africa that were once the capital of Oman’s sultans. In 1964, months after a revolution, Zanzibar joined Tanganyika to form Tanzania, and it still has its own president, parliament and constitution.

Written from cited sourcesLast checked 28 September 2026Suggest a correction

TANZANIAZanzibar CityChake Chake
ZanzibarUnguja (Zanzibar Island, south) and Pemba (north), from OpenStreetMap’s boundary cut to Atlas’s coastline. The mainland is the rest of Tanzania.

See it on the globe:Tanzania →Oman →

On the monsoon routes

Zanzibar Island, also called Unguja, lies 35 km off the East African coast; Pemba is the other main island.[3][1] The prevailing winds put the islands on the Indian Ocean trade routes, open to traders and settlers from Arabia, south Asia and the African mainland.[3] Persians arrived from the 10th century and merged into the local population, and many Africans on the islands still call themselves “Shirazi”.[3]

Arabs from Oman became the islands’ landowning aristocracy. In 1832 Sultan Said ibn Sultan made Zanzibar his capital, and it became the hub of the slave and ivory trade into the African interior, as well as a producer of cloves and coconuts.[3] In 1861 Zanzibar was split from Oman as a sultanate of its own.[3]

Protectorate, revolution and union

In 1890 Britain declared a protectorate over Zanzibar that lasted more than 70 years. On 27 August 1896 it fought the Anglo-Zanzibar War to remove a sultan it didn’t want; the fighting took less than an hour, and it is considered the shortest war on record.[3]

Zanzibar became independent in 1963 as a constitutional monarchy. Its government was led by the mainly Arab Zanzibar Nationalist Party, although the mainly African Afro-Shirazi Party had won more votes.[1] In January 1964 a revolution overthrew the sultan. Many Arabs were killed, mutilated or imprisoned.[1][3] On 26 April 1964 Zanzibar and Tanganyika united to form what was soon named Tanzania.[1][3]

Two governments, not three

Tanzania’s constitution splits government into “Union Matters” and everything else. The Union government handles the Union Matters for the whole country, and all other matters for the mainland only; the Revolutionary Government of Zanzibar handles all other matters for the islands.[2] Union Matters include the constitution, currency and banking, income tax and customs, harbours, air transport and posts, oil and gas, and political parties.[2]

Zanzibar has its own constitution of 1984, its own judiciary, and a House of Representatives whose laws on Union Matters are void, just as the national parliament’s laws on Zanzibar’s own matters are.[2] If the president of Tanzania comes from one side of the union, the vice-president must come from the other.[2] The authority of Zanzibar’s government can only be changed by two-thirds of the MPs from each side.[2]

“Legislative power in Tanzania Zanzibar over all matters which are not Union Matters is hereby vested in the House of Representatives.”[2]

Constitution of Tanzania

A contested union

Zanzibar’s first president, Abeid Karume, negotiated the union with Julius Nyerere. He was assassinated in 1972.[1] The ruling parties of the two sides then merged into Chama Cha Mapinduzi (CCM), which took back some of the islands’ autonomy, especially over security and banking. Some still question whether Karume had the authority to sign the union.[1]

Elections in Zanzibar have often been disputed and violent.[1] In 2010 CCM and the opposition Civic United Front (CUF) agreed to share power in a government of national unity. In 2015 the Zanzibar Electoral Commission annulled the election, which CUF said it had won. CUF boycotted the rerun in March 2016, CCM won every seat, and the unity government effectively ended.[1]

Timeline

  1. 1832

    Omani capital

    The sultan of Oman makes Zanzibar his capital.[3]

  2. 1861

    Own sultanate

    Zanzibar is separated from Oman.[3]

  3. 1890

    British protectorate

    Britain declares a protectorate.[3]

  4. 189627 August 1896

    Shortest war

    The Anglo-Zanzibar War lasts less than an hour.[3]

  5. 1963

    Independence

    Zanzibar becomes independent under its sultan.[3][1]

  6. 1964

    Revolution

    The sultanate is overthrown in January.[3]

  7. 196426 April 1964

    Union

    Zanzibar and Tanganyika unite as Tanzania.[1]

  8. 1972

    Karume killed

    Zanzibar’s first president is assassinated.[1]

  9. 1984

    Constitution

    Zanzibar adopts its own constitution.[2]

  10. 2010

    Unity government

    CCM and CUF agree to share power.[1]

  11. 2016

    Boycotted rerun

    CUF boycotts the rerun of the annulled 2015 election.[1]

More autonomous regions

Sources

  1. [1]
  2. [2]
    Tanzania (United Republic of)’s Constitution of 1977 with amendments through 2005 (English translation) · Constitute Project

    Article 4 and the First Schedule (Union Matters); the House of Representatives; the vice-president; List Two.

  3. [3]
    Zanzibar · Encyclopaedia Britannica
  4. [4]
    Zanzibar (relation 3775035) · OpenStreetMap contributors

    Outline for the map, cut to the 1:50m coastline and simplified.

Map geometry from Natural Earth via world-atlas. See credits.

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