Lakes in Africa: The Major Lakes, Where They Are and Why They Formed
A direct guide to Africa's major lakes: which are largest by area, which are deepest, where they sit, and how the East African Rift built most of them. Includes a comparison table, notes on Lake Chad's shrinkage, and the exam facts people usually get wrong.
A direct guide to Africa's major lakes: which are largest by area, which are deepest, where they sit, and how the East African Rift built most of them. Includes a comparison table, notes on Lake Chad's shrinkage, and the exam facts people usually get wrong.
The short answer: Africa's biggest lakes
Lake Victoria is the largest lake in Africa by surface area, about 68,800 square kilometres, shared by Tanzania, Uganda and Kenya. Lake Tanganyika is the deepest, reaching roughly 1,470 metres, second only to Lake Baikal in the world. After those two come Lake Malawi (also called Lake Nyasa), Lake Turkana, Lake Albert, Lake Chad and a long tail of smaller rift and crater lakes.
Most of Africa's big freshwater lakes sit in one belt running north to south through the east of the continent. That is not a coincidence. The exception that gets asked about most is Lake Chad, which sits in the Sahel, thousands of kilometres west, and behaves nothing like the rift lakes.
| Lake | Approx. area (sq km) | Max depth (m) | Countries |
|---|---|---|---|
| Victoria | 68,800 | 83 | Tanzania, Uganda, Kenya |
| Tanganyika | 32,900 | 1,470 | Tanzania, DR Congo, Burundi, Zambia |
| Malawi (Nyasa) | 29,600 | 706 | Malawi, Mozambique, Tanzania |
| Turkana | 6,400 | 109 | Kenya, Ethiopia |
| Albert | 5,300 | 51 | Uganda, DR Congo |
| Chad | 1,500 and variable | Under 11 | Chad, Cameroon, Niger, Nigeria |
| Kariba (reservoir) | 5,580 | 97 | Zambia, Zimbabwe |
| Volta (reservoir) | 8,500 | 75 | Ghana |
Why the East African Rift made so many deep lakes
The African plate is splitting. Along the East African Rift, the crust has been pulling apart for around 25 million years, dropping long blocks of ground between parallel faults. Water collects in those troughs. Because the floors are structural, not carved by rivers or ice, the lakes end up narrow, very long and startlingly deep.
Tanganyika is the clearest case. It runs about 670 kilometres north to south but averages only around 50 kilometres wide. Its floor lies well below sea level. Malawi has the same shape for the same reason.
Victoria breaks the pattern and this trips people up. It is not a rift lake. It sits in a shallow basin between the western and eastern arms of the rift, formed when uplift on either side blocked west-flowing rivers and ponded the water back. That is why it is enormous in area but only about 80 metres deep at most. A shallow pan, not a trench.
Soda lakes, crater lakes and the salty ones
Not every African lake is fresh. Where a lake has no outlet, water leaves only by evaporation and the dissolved salts stay behind. In the Kenyan and Tanzanian rift you get soda lakes, loaded with sodium carbonate from volcanic rock, with pH values above 10 in places.
Lake Natron in Tanzania is the extreme version. It can hit 60 degrees Celsius at the surface and the water is caustic enough to preserve dead birds. It is also where most of East Africa's lesser flamingos breed, because almost nothing else can live there to eat the eggs.
Lake Turkana is the world's largest permanent desert lake and the largest alkaline lake. It gets around 90 percent of its inflow from the Omo River in Ethiopia, which matters a great deal now that the Gibe III dam upstream controls that flow. Turkana has no outlet at all.
Then there are the crater lakes, small circles of water sitting in old volcanic calderas around western Uganda and Cameroon. Lake Nyos in Cameroon is the famous one. In August 1986 it released a huge cloud of carbon dioxide that had built up in its depths, and the gas suffocated more than 1,700 people in the valleys below overnight.
Lake Chad: the one that keeps shrinking
In the 1960s Lake Chad covered somewhere around 25,000 square kilometres. By the mid 1980s it was down to roughly a tenth of that. The lake is extremely shallow, often less than seven metres, so a small drop in water level strips off a huge area of surface.
Two things drove it. Rainfall across the Sahel fell sharply from the late 1960s through the 1980s. And irrigation withdrawals from the Chari and Logone rivers, which supply almost all of the lake's water, rose steeply over the same decades.
The lake has partly recovered since the 1990s and satellite records show it holding steadier than the old headlines suggest. It has not gone back to its 1960s size and probably will not. Around 30 million people across four countries still depend on it, which is why the plan to divert water from the Congo basin keeps getting revived and keeps stalling on cost.
How the lakes connect to Africa's rivers
Lake Victoria is the largest single source feeding the Nile. Water leaves at Jinja in Uganda as the Victoria Nile, runs through Lake Kyoga, drops over Murchison Falls and enters Lake Albert. From there it becomes the Albert Nile, then the White Nile in South Sudan, and eventually meets the Blue Nile at Khartoum. If you want the wider picture, our guide to the rivers in Africa maps how these systems join up.
Tanganyika drains the other way, west into the Congo through the Lukuga River. Malawi drains south via the Shire into the Zambezi. Turkana and Chad drain nowhere.
That last distinction is the one worth carrying away. Whether a lake has an outlet decides almost everything else about it: fresh or salty, stable or shrinking, full of fish or full of flamingos. Check the outlet first and the rest of the lake makes sense.
FAQs
Which is the largest lake in Africa?
Lake Victoria, at roughly 68,800 square kilometres. It is the second largest freshwater lake in the world by surface area, after Lake Superior, and is shared between Tanzania, Uganda and Kenya.
How many African Great Lakes are there?
There is no fixed number, but the core group is usually given as Victoria, Tanganyika, Malawi, Turkana, Albert, Edward and Kivu. Some lists add Lake Kyoga and Lake Rukwa.
Which African lake is the most dangerous?
Lake Nyos in Cameroon, because of the carbon dioxide dissolved in its deep water. A release in 1986 killed over 1,700 people, and the lake now has degassing pipes installed to vent the gas slowly.
Is Lake Victoria a rift valley lake?
No. It sits in a shallow depression between the eastern and western arms of the East African Rift, formed by uplift damming rivers, which is why it is only about 80 metres deep despite its size.
Which African lake has the most fish species?
Lake Malawi, with somewhere between 700 and 1,000 cichlid species, most found nowhere else. Lake Victoria once had around 500 cichlid species but lost a large share after Nile perch were introduced in the 1950s and 1960s.
What is the deepest lake in Africa?
Lake Tanganyika, at about 1,470 metres at its deepest point. It holds roughly 16 percent of the world's available fresh surface water.
