Lake Kariba is an inland sea in the middle of Africa: one of the largest man-made lakes in the world, so big that from its shores you can't see the other side. It was born in the late 1950s, when the Zambezi River was dammed to build a gigantic hydroelectric plant, flooding an entire valley. The result is an immense lake, 220 km long, shared between Zambia and Zimbabwe, with islands, calm bays and some of the most famous sunsets on the continent.
On the Zambian side, the town of Siavonga is the gateway to this world of water. Here the trip isn't about safaris but about relaxing: you sail on 'houseboats' —floating homes with cabins, a deck and a pool— that cruise the lake at a leisurely pace, fish for the hard-fighting tigerfish, soak up the sun and watch hippos, crocodiles and elephants coming down to drink at the shore. Next to the town stands the imposing Kariba Dam, a colossal feat of engineering and, at the same time, the setting for human dramas and legends.
This guide covers Zambian Kariba: how to get to Siavonga from Lusaka, what the houseboat experience is like, what there is to do —fishing, cruises, visiting the dam— and the powerful history behind the lake: the relocation of the Tonga people, the legend of the river serpent god Nyaminyami and Operation Noah, the rescue of thousands of animals trapped by the rising waters. A different kind of destination, peaceful and full of soul.
Lake Kariba didn't exist until the late 1950s: it's man-made. Between 1955 and 1959, in a gorge of the Zambezi River called Kariba, a huge arch dam designed by French engineer André Coyne was built to supply electricity to what were then the Rhodesias. When the floodgates closed, the river slowly flooded the Gwembe Valley, creating a gigantic lake and forcing the relocation of some 57,000 Tonga people, who believed the river's serpent god, Nyaminyami, would take revenge. As the waters rose, the famous Operation Noah rescued thousands of animals stranded on the islands. That story —of engineering, uprooting and legend— is told on our history page.
Read the full history ↓Where the great Zambezi River widens towards the south: canoe safaris among elephants and hippos, and one of the largest man-made lakes in the world, created by a colossal dam.
Read the history of The Lower Zambezi and Lake Kariba →They depart from Lusaka, 135 km away. If you book from this link we earn a commission and you pay no more.
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Origins, formation and what the sources say.
Before the lake existed, the place where that 220-kilometre inland sea now stretches was a valley: the Gwembe Valley, a hot, narrow stretch of the Zambezi River hemmed in by escarpments. For centuries, that valley was home to the Tonga (or Batonga) people, farmers and fishers who lived on the riverbanks, cultivated its fertile terraces when the floods receded and had a culture deeply tied to the Zambezi.
For the Tonga, the river was not just water: it was the dwelling place of Nyaminyami, the serpent god of the Zambezi, a deity with the body of a snake and the head of a fish who, according to their tradition, ruled the river and protected his people. Nyaminyami and his wife lived, they said, in the Kariba Gorge, and separating them or tampering with the river would bring misfortune. This belief would be central to the drama that was about to unfold.
The Gwembe Valley was a relatively isolated world, with its own rhythm set by the floods and droughts of the great river. The Tonga could not have imagined that, in the mid-20th century, a decision made far away, in colonial offices, would wipe their valley off the map and change their lives forever.
In the early 1950s, the Federation of Rhodesia and Nyasaland, dominated by British colonial interests, needed electricity for its development, above all for the copper mining industry. It was decided to build a large hydroelectric dam on the Zambezi, and after heated debate the Kariba Gorge was chosen over other options. The project was entrusted to the French engineer André Coyne, one of the world's leading specialists in arch dams.
The works, carried out mainly by an Italian company, began in 1955 and were enormous: a double-curvature arch wall some 128 metres high was raised, requiring close to a million cubic metres of concrete. The construction was not without tragedy: dozens of workers died in accidents, some buried in the concrete itself, and a huge Zambezi flood in 1957 and another in 1958 came close to wrecking the project. For the Tonga, those 'impossible' floods were the fury of Nyaminyami, who refused to let his river be locked up.
At the end of 1958 the floodgates were closed and the Zambezi began to build up behind the wall. The lake grew slowly over the years, covering the Gwembe Valley, until it reached its maximum level in 1963. Lake Kariba was born, and with it one of the largest hydroelectric plants in Africa, which still supplies power to Zambia and Zimbabwe today.
The human cost of the dam was paid by the Tonga people. To create the lake, some 57,000 people —some sources say more than 50,000— who lived in the valley that was to be flooded had to be relocated. They were moved, often by force, to higher, drier land on both sides of the future lake, in Zambia and in what was then Southern Rhodesia.
The uprooting was traumatic. The Tonga lost their fertile riverside terraces, their sacred sites, the graves of their ancestors and the relationship with the Zambezi that shaped their culture. The land they were taken to was poorer for farming, and many fell into poverty and dependence. In 1958, when the authorities tried to forcibly move a group at Chisamu, on the side of present-day Zimbabwe, a clash broke out in which several Tonga were killed by the colonial police. For them, Nyaminyami's promise was coming true: the serpent god, separated from his wife by the wall, was taking his revenge.
The case of the Gwembe Tonga became a classic, much-studied example of the social consequences of large dams: how a project meant to bring 'progress' can destroy the lives of entire communities who were neither consulted nor fairly compensated. Decades later, many descendants of those displaced are still calling for recognition and reparations.
As the waters rose and covered the valley, another drama unfolded, this time with a happier ending, and it made headlines around the world: Operation Noah. As the lake grew, thousands of animals were stranded on hilltops that were turning into ever smaller islands surrounded by water. Without help, they would drown or starve.
Between 1958 and 1964, a team led by the Rhodesian game ranger Rupert Fothergill set out to rescue them. With boats, nets, ropes and a huge dose of courage, they caught the animals stranded on the islands —from antelopes, zebras and monkeys to rhinos, leopards, snakes and elephants— and moved them to the mainland, to what is now partly Matusadona National Park, on the Zimbabwean side. In total, the operation saved more than 6,000 animals of dozens of species.
Operation Noah became an early symbol of African wildlife conservation and a famous race-against-the-clock rescue story. The name, inspired by Noah's ark in the biblical flood story, fitted the scene perfectly: a small group of men saving animals from a flood caused, in this case, by man himself.
More than sixty years later, Lake Kariba is a cornerstone of the economies of Zambia and Zimbabwe. Its two hydroelectric plants, Kariba North (Zambia) and Kariba South (Zimbabwe), generate a large share of both countries' electricity, although increasingly severe droughts linked to climate change have lowered the lake's level and caused serious power cuts in recent years, a reminder of how dependent both nations are on this reservoir.
The lake also transformed life in the region. Where a river once ran there was now an inland sea that gave rise to a large fishing industry, above all for kapenta, a small fish introduced from Lake Tanganyika in the 1960s that is now caught at night from lit-up rigs. Towns such as Siavonga and Sinazongwe sprang up on the Zambian side and Kariba town on the Zimbabwean side, and with them came tourism: houseboats, tiger fishing and the famous sunsets.
In recent years, the safety of the old dam has worried engineers: erosion at the foot of the wall, caused by decades of water released through the spillway, called for a major international rehabilitation project to reinforce the structure and prevent a disaster. And so Lake Kariba remains what it has been from the start: a work that combines the grandeur of human engineering, the drama of displaced peoples and the power of a nature that —like the mythical Nyaminyami— never quite lets itself be tamed.
