Northern Tanzania holds some of the most important palaeoanthropological sites in the world. Olduvai Gorge, a canyon of about 48 kilometres cutting through the eastern plains of the Serengeti, became an open book on human origins thanks to the work of Louis and Mary Leakey. In 1959, Mary Leakey unearthed the skull of a Paranthropus boisei (nicknamed "Nutcracker Man") there, about 1.75 million years old, and soon afterwards remains of Homo habilis turned up alongside the oldest known knapped stone tools, which gave their name to an entire industry: the Oldowan.
About 45 kilometres to the south, at Laetoli, Mary Leakey made one of the most moving finds in science in 1978: a trail of footprints fossilised in volcanic ash, left some 3.6 million years ago by hominins of the species Australopithecus afarensis. They are the oldest direct evidence that our ancestors already walked on two legs, long before there was a large brain or any toolmaking. That trail of footsteps, frozen in the mud of a volcano, is one of the reasons this region of the world is called, quite rightly, the cradle of humanity.
Before the arrival of Bantu-speaking peoples, the interior of Tanzania was home to hunter-gatherer communities related to today's Hadza, and to speakers of Cushitic and Khoisan languages. The Hadza of Lake Eyasi and the Datoga still preserve traces of those ancient ways of life, with click languages that link them to peoples in the south of the continent.
Between the first millennium BCE and the first centuries of the Common Era, waves of Bantu-speaking farmers and ironworkers, originally from the region of present-day Nigeria and Cameroon, spread across central and eastern Africa. They brought farming, livestock and, above all, ironworking, which transformed the region's economy. These Bantu peoples were the demographic and linguistic foundation on which almost everything else was later built: today more than 90% of Tanzanians speak Bantu languages, and Swahili, the lingua franca of the country and of much of East Africa, is a Bantu language deeply enriched by centuries of contact with the Indian Ocean world.
While the interior moved to the rhythm of farming villages, the coast was living a different story. From at least the 8th century, the ports along the shore became part of the great Indian Ocean trade network linking East Africa with Arabia, Persia, India and even China. From that meeting between the Bantu peoples of the coast and Muslim merchants and settlers, Swahili culture was born: coral-stone city-states, mosques, cosmopolitan traders and a language of its own, Kiswahili, written in Arabic script.
The most brilliant of those cities was Kilwa Kisiwani, on an island in the south of present-day Tanzania. Between the 11th and 15th centuries, Kilwa controlled the gold trade coming out of Sofala (in present-day Mozambique) and came to hold sway over other Swahili towns such as Mombasa, Pemba, Zanzibar and Mafia. Its wealth paid for the Great Palace of Husuni Kubwa and the Great Mosque, whose coral ruins, now a UNESCO World Heritage Site, are still astonishing. The Arab traveller Ibn Battuta, who visited around 1331, described it as one of the most beautiful and best-built cities in the world. Gold, ivory and also enslaved people passed through Kilwa, in a trade that even then connected the depths of Africa with the markets of Asia.
The balance of the Swahili coast was shattered by the European arrival. In 1498 Vasco da Gama called at these ports on his way to India, and in the first decades of the 16th century the Portuguese sacked and subdued the main cities, Kilwa and Mombasa among them, to control the spice route. They built forts, levied tribute and set off a long decline in Swahili prosperity, although they never achieved deep control of the territory.
Portuguese power was driven out not by other Europeans but by the Arabs of Oman. In the late 17th century, the forces of the Sultanate of Oman expelled the Portuguese from much of the coast (the capture of Fort Jesus in Mombasa in 1698 was the decisive blow) and extended their influence over the coastal cities. In 1784 the Omanis conquered Kilwa. So, after two centuries of European presence, the coast of present-day Tanzania fell into the orbit of an Arab empire from the Persian Gulf, a shift that would shape the whole of the following century.
The 19th century turned Zanzibar into the centre of a commercial empire. Sultan Said bin Sultan of Oman was so taken with the wealth of the archipelago that around 1832-1840 he moved his court from Muscat to Stone Town, on the island of Unguja. Under his rule, Zanzibar filled with clove plantations (an introduced crop that made it the world's largest producer), worked by enslaved labour. The island became the heart of an economy that revolved around three goods: cloves, ivory from the African interior, and enslaved people.
In those decades the slave trade reached enormous proportions and left a deep wound. Caravans set out from the coast into the interior, sometimes as far as the Great Lakes, capturing and buying people who were forced to walk to the coast and shipped to Zanzibar. By the middle of the century Kilwa had become the main transit point for the Zanzibar slave market, one of the largest in the Indian Ocean. Historians debate the figures, but it is estimated that tens of thousands of people passed through the island's market every year in the middle decades of the century. Under British pressure, Sultan Barghash signed a treaty in 1873 that closed the Zanzibar slave market, although slavery as an institution took decades more to be fully abolished. It is a hard and unavoidable part of this history, and it deserves to be told precisely and without embellishment: it was a massive human tragedy on which much of the coast's prosperity was built.
In the mid-19th century, the East African coast became the gateway for the great European expeditions seeking to unravel the interior of the continent and, above all, the sources of the Nile. In 1857-1858 the Britons Richard Burton and John Hanning Speke set out from the coast and reached Lake Tanganyika; Speke continued alone to the lake he named Victoria and which he identified, correctly, as the main source of the Nile.
The missionary and explorer David Livingstone travelled through the region denouncing the slave trade he saw along the way, and his disappearance led to one of the most famous scenes of the era: in 1871, the journalist Henry Morton Stanley found him at Ujiji, on the shores of Lake Tanganyika, with the greeting that went around the world. These journeys, a mix of scientific curiosity, religious zeal and imperial ambition, put East Africa on Europe's mental map just as the powers were getting ready to carve it up.
At the Berlin Conference of 1884-1885, the European powers divided up the continent on paper, and the interior of present-day mainland Tanzania was assigned to Germany. Carl Peters's German Colonisation Society signed dubious treaties with local chiefs and, after agreements with Britain in 1886 and 1890 that fixed the borders, German East Africa (Deutsch-Ostafrika) was born, covering present-day Tanganyika, Rwanda and Burundi.
German rule was harsh and met resistance from the start. On the coast, the Abushiri revolt (1888-1889) pitted Swahili and Arab traders against the colonial administration. The Germans imposed compulsory crops, taxes and forced labour, built the railways towards Lake Tanganyika and Kilimanjaro, and organised the territory with the discipline and violence typical of the colonialism of the time. That regime of exactions would very soon spark the largest anti-colonial uprising in the region.
In 1905 the Maji Maji rebellion broke out in southern Tanganyika, the largest resistance against German rule. The trigger was the system of forced cotton growing the administration imposed on communities, but the revolt united very different peoples around a shared idea. A healer named Kinjikitile Ngwale spread the belief that a sacred water (maji, in Swahili) could turn German bullets into water and protect the fighters. That faith, more than any army, gave the insurrection its name and its momentum.
The German repression was devastating. Unable to win on a conventional battlefield, the colonial troops applied a scorched-earth policy: they burned villages, fields and harvests to starve the rebel population. The combination of war and famine left an enormous death toll; historians' estimates vary widely, from around 75,000 to figures of 200,000 to 300,000 dead by 1907, when the revolt was finally put down. Beyond the debate over the numbers, Maji Maji was etched into memory as a founding episode of Tanzanian national consciousness and as one of the bloodiest chapters of German colonialism in Africa.
The First World War reached East Africa too. Between 1914 and 1918, German troops under General Paul von Lettow-Vorbeck waged a guerrilla war that kept far larger British forces in check and only surrendered after the armistice in Europe. The campaign, fought largely with African soldiers (askaris) and forced porters on both sides, caused great suffering among the civilian population.
After Germany's defeat, the League of Nations handed the territory to Britain as a mandate, under the name Tanganyika (the north-west, Ruanda-Urundi, went to Belgium). The British governed through indirect rule, relying on local authorities, and after the Second World War the territory became a United Nations trust territory, with a commitment to steer it towards self-government. It was within that framework, more flexible than that of a full colony, that the nationalist movement which would lead to independence took root.
The architect of independence was Julius Kambarage Nyerere, a schoolteacher educated in Edinburgh whom his compatriots would fondly call Mwalimu, "the teacher" in Swahili. In 1954 he founded the Tanganyika African National Union (TANU), a party that channelled anti-colonial discontent peacefully and on a mass scale, using Swahili as a unifying language above ethnic divisions.
The transition was relatively orderly. After years of political and electoral pressure, Tanganyika achieved self-government and finally independence on 9 December 1961, with Nyerere as prime minister. The following year, in 1962, the country became a republic and Nyerere its first president. Unlike other African cases, Tanganyika's independence was won without war, something Nyerere made a point of pride and which earned him enormous prestige at home and abroad as one of the voices of Pan-Africanism.
While the mainland gained independence peacefully, Zanzibar took a more violent path. The archipelago became independent from the United Kingdom in December 1963 as a monarchy headed by the sultan, but the new state left political power in the hands of the Arab minority, over a marginalised African majority. On 12 January 1964 the Zanzibar Revolution broke out: militants of the Afro-Shirazi Party, with John Okello leading the armed uprising, overthrew the sultan and his government within hours.
The revolution was followed by a wave of violence and reprisals against people of Arab and Indian descent; estimates of the death toll vary enormously between sources, from a few hundred to many thousands, and remain a matter of historical debate. The moderate leader Abeid Amani Karume took charge of the new state. A few months later, on 26 April 1964, Karume and Nyerere signed the union of Tanganyika and Zanzibar into a single country. Shortly afterwards that state took the name Tanzania (a blend of Tanganyika and Zanzibar), with a central government and, at the same time, a semi-autonomous government for Zanzibar that endures to this day.
In 1967, with the Arusha Declaration, Nyerere launched his most ambitious project: ujamaa, a Swahili word meaning "familyhood" or "community", which gave its name to a model of African socialism based on self-reliance (kujitegemea) and solidarity. The state nationalised banks, industries and large estates and, above all, pushed the ujamaa villages: the regrouping of the rural population, largely by force, into collective settlements where farm work and access to schools and clinics were shared.
The verdict is still debated and deserves to be told honestly. On the social side, ujamaa left real achievements: Tanzania reached remarkably high literacy rates for the Africa of the time, expanded healthcare and basic education, and built a strong national identity and peaceful coexistence among more than 120 ethnic groups, something exceptional on the continent. On the economic side, however, the forced resettlement of farmers, falling agricultural output, the oil crisis and the costly 1978-1979 war against Idi Amin's Uganda, in which Tanzanian troops overthrew him, plunged the country into a serious crisis. In 1985 Nyerere stepped down voluntarily (a rare gesture in the region) and admitted frankly that many of his economic goals had not been met.
Nyerere's successor, Ali Hassan Mwinyi, began a shift towards a market economy in the 1980s and 1990s, gradually abandoning the ujamaa model under pressure from the crisis and from international financial institutions. In 1992 the country left the single-party system behind and adopted multiparty politics, although the historic party, Chama Cha Mapinduzi (CCM, "Party of the Revolution"), heir to TANU, has stayed in power without interruption to this day.
In the 21st century, Tanzania has established itself as one of the most stable countries in East Africa, with steady economic growth driven by agriculture, mining (gold and natural gas) and, above all, tourism: the northern safaris, Kilimanjaro and the beaches of Zanzibar draw travellers from all over the world. The presidency of John Magufuli (2015-2021) marked a period of heavy state intervention and growing tension with the opposition and the press. On his death in March 2021, Vice-President Samia Suluhu Hassan took office, the first woman to lead the country and a native of Zanzibar, and she pushed for political and economic opening. Today Tanzania looks to the future without forgetting that its soil holds both the oldest footprints of humanity and the scars of an intense history.
The 4 histories, one after another. Use the buttons above to jump to the one you want.
Arusha began as a small outpost on the lands of the Arusha and Meru peoples, farmers of the fertile slopes of Mount Meru. The Germans built a fort there in the early 20th century, and the British turned it into an administrative and farming centre surrounded by coffee plantations. Its mild highland climate and strategic position, halfway between Cairo and Cape Town, eventually gave it far more weight than its size would suggest.
Today Arusha is the undisputed gateway to the northern safaris: circuits to the Serengeti, Ngorongoro, Tarangire and Manyara set off from here, and those coming down from Kilimanjaro return here. A lively, cosmopolitan city, a mix of markets, hotels and safari agencies, it is where the journey through wild Tanzania begins and ends.
Arusha holds a prominent place in the political history of Tanzania and of Africa. It was here that Julius Nyerere proclaimed the Arusha Declaration in 1967, the founding document of ujamaa and Tanzanian socialism, which set the country's course for almost two decades.
Its role as a meeting place has only grown. Arusha is the seat of the East African Community (EAC), the regional integration bloc, and of the African Court on Human and Peoples' Rights. Between 1994 and 2015 it also hosted the International Criminal Tribunal for Rwanda, which tried the crimes of the 1994 genocide in the neighbouring country. All this has earned it the nickname "the Geneva of Africa", a city where treaties are negotiated and international justice is handed down in the shadow of Kilimanjaro and Meru.
At 5,895 metres, Kilimanjaro is the highest mountain in Africa and the largest free-standing volcano in the world, a giant that rises alone from the plain up to Uhuru Peak ("freedom" in Swahili), crowned with glaciers right on the equator. The mountain is actually a dormant volcano with three cones, of which Kibo is the highest. For the Chagga peoples who live on its fertile slopes, Kilimanjaro has always been a sacred presence and the source of the water that feeds their coffee and banana plots.
According to the European record, the summit was first reached by the German geographer Hans Meyer and the Austrian mountaineer Ludwig Purtscheller in 1889. A curious detail from the colonial era: when Queen Victoria supposedly gave the mountain to her grandson, Kaiser Wilhelm II, the border between the British and German colonies was bent to place Kilimanjaro inside German East Africa, a geopolitical whim still visible on the map. Today the mountain is a national park and a World Heritage Site, and its rapidly shrinking glaciers have become a global symbol of climate change.
The slopes of Kilimanjaro are one of the most densely populated and prosperous regions of Tanzania, thanks to the Chagga people. Skilled farmers, the Chagga developed centuries ago an ingenious system of irrigation channels and multi-level gardens (known as kihamba), which combines bananas, coffee and other crops on the same plot, making the most of the volcanic soil and the mountain rains.
The arrival of coffee in colonial times fitted perfectly with this farming culture. The Chagga founded pioneering coffee cooperatives (the Kilimanjaro Native Cooperative Union, set up in 1932, was one of the first in Africa), which gave them some economic and educational independence from the colonial administration. That drive explains why so many Tanzanian leaders, professionals and traders come from this region, and why Kilimanjaro's highland coffee is still one of the country's best-known products.
In the shadow of the giant Kilimanjaro stands another remarkable mountain, Mount Meru, a 4,566-metre volcano that towers over the city of Arusha and is the fourth-highest peak in Africa. Less famous than its neighbour, Meru is nonetheless a demanding climb and excellent acclimatisation training for those who go on to tackle Kilimanjaro.
Meru is the heart of Arusha National Park, a small park with surprising variety: within a few kilometres it brings together the volcano's caldera, the alkaline Momella Lakes where flamingos gather, and the forests of Ngurdoto Crater, home to colobus monkeys and buffalo. For many travellers it is their first contact with Tanzanian nature before heading off to the big parks further west, and proof that the Arusha and Kilimanjaro region is much more than a stopover.
The name Serengeti comes from Maa, the language of the Maasai: siringet, "the land that runs on forever", a perfect description of plains that seem to have no horizon. For centuries these grasslands were grazing land for the Maasai, who arrived in the region around the 17th and 18th centuries from the Nile valley and lived alongside the vast herds without wiping them out.
The Serengeti's natural spectacle revolves around the Great Migration: every year more than a million wildebeest and hundreds of thousands of zebras and gazelles travel a circular route between the Serengeti and Kenya's Maasai Mara, following the rains and the fresh grass, in the largest movement of land mammals on the planet. That spectacle, together with the abundance of lions, cheetahs and elephants, made the Serengeti the most famous park in Africa and the emblem of the Tanzanian safari.
Conservation in the Serengeti has a history of its own. The British declared the area a game reserve in the 1920s and a national park in 1951, the first in Tanganyika. But the big boost to its worldwide fame came from the German zoologist Bernhard Grzimek and his son Michael, who in 1959 released the book and the documentary Serengeti darf nicht sterben ("Serengeti Shall Not Die"), winner of an Oscar, after studying the migration routes from a light aircraft. Michael died in a plane crash during that work and is buried on the rim of the Ngorongoro Crater.
The creation of the park came at a human cost that is acknowledged more openly today: the Maasai who lived in the heart of the Serengeti were moved outside its boundaries, towards the Ngorongoro area, in the name of conservation. It is a tension that runs through the whole history of the northern parks and is still alive in current debates about the place of pastoralist peoples in these protected lands.
A few hours from the Serengeti lies one of Africa's geological wonders: the Ngorongoro Crater, actually a caldera, the remains of a huge volcano that collapsed some two to three million years ago. With about 260 square kilometres of flat floor ringed by walls up to 600 metres high, it is the largest intact volcanic caldera in the world, and inside it lives an astonishing density of wildlife: you can see the Big Five (lion, elephant, buffalo, leopard and black rhino) in a single day.
Ngorongoro is not a closed national park but a multiple-use Conservation Area, a model designed so that wildlife and Maasai herders share the land. The Maasai may bring their cattle into the crater to graze and drink, although they may not live inside it. That model of coexistence, unique in Tanzania, makes Ngorongoro an ongoing laboratory for balancing nature, traditional herding and tourism.
The northern circuit has an added value that no other safari in the world can offer: it literally passes through the cradle of humankind. Olduvai Gorge and the Laetoli footprints lie inside the Ngorongoro Conservation Area, between the crater and the Serengeti. Many travellers on their way to see lions stop at the small Olduvai museum, next to the canyon where the Leakeys unearthed Homo habilis and the oldest stone tools.
That combination of spectacular wildlife and first-rate palaeoanthropological sites is why Ngorongoro is one of the few places in the world listed by UNESCO for both its natural and its cultural value. The same landscape is shared by the wildebeest of the migration, Maasai herders and the fossilised footprints our ancestors left 3.6 million years ago.
The northern circuit is rounded off by two smaller parks that are full of character. Tarangire National Park, created in 1970, is famous for its huge elephant herds, some of the largest in Tanzania, and for the ancient baobabs that dot the savannah like sentinels. In the dry season, the Tarangire River draws wildlife from across the region, which comes down to drink in spectacular numbers.
Lake Manyara National Park, at the foot of the great Rift Valley, is known for two rarities: its tree-climbing lions that lounge stretched out on the branches, and the flocks of pink flamingos that at certain times of year colour the shores of the alkaline lake. Ernest Hemingway wrote admiring pages about Manyara, and the park was the base for pioneering studies of elephants. Together, Tarangire and Manyara show that the northern circuit is much more than the Serengeti.
Dar es Salaam, Tanzania's largest city and its economic capital, is relatively young by the standards of the Swahili coast. It was founded in the 1860s by the Sultan of Zanzibar, Majid bin Said, who was looking for a new port on the mainland and gave it the Arabic name Dar es Salaam, "the house of peace". A port city with a great future grew up on the site of the old fishing village of Mzizima.
The Germans made it the capital of German East Africa in 1891, and the British kept that role during the Tanganyika mandate. It was the capital of independent Tanzania until 1974, when it was decided to move the capital to Dodoma, in the centre of the country, a slow process that was only completed in recent decades. Even so, Dar es Salaam is still the economic heart, the country's main port and its most populous and bustling city, the gateway to the whole southern Swahili coast.
The coast and south of Tanzania hold the oldest roots of Swahili civilisation. It was here, on the island of Kilwa Kisiwani, that the richest sultanate on the whole coast flourished between the 11th and 15th centuries, thanks to the gold trade from Sofala. The coral-stone ruins of Kilwa and nearby Songo Mnara, now a World Heritage Site, are the physical evidence of that medieval splendour.
In the 19th century this same coastline became one of the darkest places in the region's history: Kilwa turned into the main embarkation point for slave caravans coming from the interior bound for Zanzibar. The south is also the land of the 1905 Maji Maji rebellion, whose suppression devastated these regions. Telling the story of southern Tanzania means telling of gold and spices, mosque and market, and the wounds of the slave trade and colonialism, without hiding either side.
The south is home to one of the largest protected areas in Africa. What was known for almost a century as the Selous Game Reserve (created by the Germans in 1896 and expanded under the British, who named it after the hunter and explorer Frederick Selous, killed there in the First World War) was declared a World Heritage Site in 1982 for its almost untouched wildlife.
In 2019, the northern part of that vast reserve became Nyerere National Park, named in honour of the father of independence. Covering more than 30,000 square kilometres, it is one of the largest parks on the continent, crossed by the great Rufiji River, which forms lakes and channels where boat safaris glide past hippos, crocodiles and water birds. Elephants, lions, buffalo and endangered African wild dogs find here one of their last great refuges, in a Tanzania far wilder and lonelier than that of the northern circuit.
Northwest of Nyerere lies Mikumi National Park, created in 1964, the year Tanzania was founded. Crossed by the highway linking Dar es Salaam with the interior and with Zambia, it is the most accessible park in the south of the country and a popular trip from the coast. Its Mkata floodplain, dotted with acacias and baobabs, is so reminiscent of the Serengeti that it is often called "the little Serengeti" or "the Serengeti of the south".
Lions, giraffes, zebras, elephants and large herds of buffalo are easy to spot on its grasslands, often from the road itself. Mikumi also works as a wildlife corridor connecting to the vast Nyerere ecosystem, and together they form one of the most important and least crowded wildlife regions in East Africa. It is proof that southern Tanzania, far from the camera flashes of the north, offers a nature experience that is as rich as it is authentic.
The coast and the south are home to a large part of Swahili and Bantu Tanzania. Along the shore, Swahili communities predominate: Muslim fishers and traders with a long seafaring tradition. Inland in the south live peoples such as the Hehe, famous for the resistance their chief Mkwawa put up against the Germans in the 1890s, and many groups that took part in the Maji Maji rebellion.
Economically, the region combines small-scale fishing and trade through the great port of Dar es Salaam with inland farming (rice, maize, and cashew nuts, of which Tanzania is a major exporter) and, increasingly, the natural gas discovered off the southern coast, which promises to transform the national economy. Add to that the emerging tourism of the southern parks and the Kilwa ruins. It is a Tanzania less familiar to travellers, but essential for understanding the country: the one that faces the Indian Ocean and holds both its oldest roots and some of its greatest hopes for the future.
The Zanzibar archipelago, made up of the islands of Unguja (usually just called Zanzibar), Pemba and several islets, was a crossroads of the Indian Ocean for more than a thousand years. Its position off the African coast, on the monsoon route, made it a natural port of call for Persian, Arab, Indian and Swahili traders. That mixing of peoples gave rise to a blended culture, deeply Muslim and Swahili-speaking, distinct from that of the mainland.
The word Zanzibar comes from the Persian Zangibar, "the coast of the Blacks", a name already used by medieval merchants. Before Oman arrived, the islands were part of the orbit of Swahili civilisation and the Kilwa Sultanate. Its particular history, that of an archipelago facing the sea and looking towards Arabia and India as much as towards Africa, explains why Zanzibar still has a semi-autonomous government within Tanzania and a proud identity of its own.
Stone Town, the old quarter of Zanzibar City, is the most complete surviving example of a Swahili trading town. Its maze of narrow alleys, coral-stone houses, mosques, Persian baths and famous carved wooden doors, with Arab, Indian and European motifs, earned it a place on the UNESCO World Heritage List in 2000. It is a blended architecture, where Arab, Persian, Indian and European influences sit on an African base.
This was the seat of the court of the sultans of Oman and later of Zanzibar, with palaces such as the House of Wonders (Beit al-Ajaib), the first building in the region with electricity and a lift. Stone Town also witnessed the abolition of the slave trade: Christ Church Anglican Cathedral was built over the old slave market, and its altar marks the spot of the whipping post, a sober reminder of the tragedy that took place there. Among others, Freddie Mercury, the singer of Queen, was born in its streets, the son of a Parsi family from the island.
The 19th and early 20th centuries tied Zanzibar ever more closely to British influence. In 1890, a treaty with Germany made the sultanate a protectorate of the United Kingdom, though it kept its sultans. From this period comes a historical curiosity: the Anglo-Zanzibar War of 27 August 1896, considered the shortest war in history, which lasted only about forty minutes, when the British navy shelled the sultan's palace after a succession London did not approve of.
Under the protectorate, Zanzibar remained a deeply unequal society: an Arab and Indian minority held power and owned the plantations, while the African majority, many of them descendants of enslaved people, stayed at the bottom. That social divide, frozen for decades, would erupt violently in the 1964 revolution, barely a month after the island's formal independence.
North of Unguja lies Pemba, smaller, greener and far less touristy, covered in hills and clove plantations. The Arabs called it Al Jazeera Al Khadra, "the green island", for its lush vegetation. It was Pemba, more than Unguja itself, that sustained Zanzibar's world lead in clove production during the 19th century and much of the 20th: for decades, the archipelago produced most of the planet's cloves.
Pemba also has a strong personality of its own. It keeps a reputation as a land of traditions and healers, has historically held a distinct political identity (often at odds with the government in Unguja), and its coral reefs in the Pemba Channel are among the best diving spots in the western Indian Ocean. It is the quietest and most authentic side of the spice archipelago.
Further south, off the mouth of the Rufiji River, Mafia Island forms a small archipelago that, unlike Zanzibar and Pemba, is administered by mainland Tanzania rather than by the government of Zanzibar. Despite the coincidence, its name has nothing to do with the criminal organisation: it is thought to come from the Arabic morfiyeh, "group" or "archipelago", or from the Swahili mahali pa afya, "healthy place".
Above all, Mafia is an underwater paradise. In 1995 Mafia Island Marine Park, Tanzania's first, was created around it to protect its coral reefs, seagrass beds and turtle-nesting beaches. Between October and March, its waters become one of the most reliable places in the world to swim alongside whale sharks, the largest fish in the ocean, which come close to shore to feed. Remote and little visited, Mafia is the hidden gem of the Tanzanian islands.
Hardly anything that happened to Tanzania happened on its own: these are the histories next door.
