Lakes in West Africa

Quick Summary

• West Africa has both natural lakes (Lake Chad) and man-made reservoirs (Lake Volta, Lake Kainji)
• Lakes provide water for drinking, irrigation, fishing, transportation, and electricity
• Lake Volta in Ghana is the world’s largest man-made lake by surface area
• Lake Chad has shrunk by over 90% since the 1960s due to climate change and overuse
• Most artificial lakes in West Africa were created by building dams on rivers

Major Lakes in West Africa

1. Lake Chad (Natural Lake)

Lake Chad sits at the meeting point of four countries: Nigeria, Niger, Chad, and Cameroon. It is the largest natural lake in West Africa, though it has become much smaller over the years.

The lake sits in the Chad Basin in the Sahel region. Rivers like Chari and Logone from Cameroon and Chad feed water into it. The Komadugu-Yobe River from Nigeria also flows into Lake Chad.

In the 1960s, Lake Chad covered about 25,000 square kilometers. Today, it covers less than 2,000 square kilometers. This huge drop happened because of less rainfall, more farming that uses water, and climate change. The shrinking lake has caused problems for the 30 million people who depend on it for water, fish, and grazing land.

Despite the shrinking, Lake Chad still supports fishing, farming during wet seasons, and provides water for animals. The lake is shallow, with an average depth of only 1.5 meters.

2. Lake Volta (Man-Made Lake)

Lake Volta in Ghana is the world’s largest man-made lake by surface area. It covers about 8,502 square kilometers, which is roughly 3.6% of Ghana’s total land area.

The lake was created in 1965 when the Akosombo Dam was built on the Volta River. The dam generates hydroelectric power that supplies most of Ghana’s electricity and some power to neighboring Togo and Benin.

The lake stretches from Akosombo in southern Ghana to the northern town of Yapei, covering about 400 kilometers. It flooded many towns and villages, forcing about 80,000 people to move to new settlements.

Today, Lake Volta is important for fishing (tilapia, catfish), transportation by boats and ferries, tourism, and irrigation. The lake has over 3,000 islands. However, water weeds like water hyacinth sometimes block parts of the lake and make fishing harder.

3. Lake Kainji (Man-Made Lake)

Lake Kainji is Nigeria’s largest man-made lake. It was created in 1968 when the Kainji Dam was built across the River Niger in Niger State and Kwara State.

The lake covers about 1,270 square kilometers and stretches for about 136 kilometers upstream from the dam. It holds about 15 billion cubic meters of water. The Kainji Dam generates 760 megawatts of electricity for Nigeria’s national grid.

Lake Kainji supports a large fishing industry. Fishermen catch tilapia, catfish, Nile perch, and other species. The lake also helps with irrigation farming during dry season and provides water for nearby towns.

The Kainji Lake National Park sits beside the lake. It protects animals like hippos, crocodiles, and many bird species. Tour boats take visitors around the lake to see wildlife and the dam.

4. Other Important Lakes

Lake Bosumtwi (Ghana): This natural lake formed in an ancient meteor crater about 1.3 million years ago. It is Ghana’s only natural lake and covers 49 square kilometers. The lake is sacred to the Ashanti people and supports fishing with traditional wooden planks instead of paddled boats.

Lagdo Reservoir (Cameroon): Created by the Lagdo Dam on the Benue River in 1982, this man-made lake covers 586 square kilometers. It generates electricity and provides water for irrigation. When the dam releases water, it sometimes causes flooding downstream in Nigeria’s Benue and Kogi states.

Asejire Lake (Nigeria): Located in Oyo State, this reservoir was built in 1972 on the Osun River. It supplies water to Ibadan city and supports fishing. The lake covers about 12 square kilometers.

Lake Kosson (Côte d’Ivoire): This man-made lake was created by damming the Sassandra River. It helps with hydroelectric power generation and fishing.

Shiroro Lake (Nigeria): Created by the Shiroro Dam on the Kaduna River in Niger State in 1990. It generates 600 megawatts of electricity and covers 320 square kilometers.

Comparison of Major West African Lakes

Importance of Lakes in West Africa

Water Supply: Lakes store fresh water that cities and towns use for drinking and daily activities. Kainji Lake supplies water to communities in Niger and Kwara States. Lake Volta provides water to towns across Ghana.

Electricity Generation: Dams on man-made lakes generate hydroelectric power. Lake Volta’s Akosombo Dam produces about 1,020 megawatts. This clean energy helps countries reduce reliance on fossil fuels and provides cheaper electricity.

Fishing Industry: Lakes support thousands of fishermen who catch fish to sell and feed their families. Lake Chad alone supports fishing for over 10 million people. Lake Volta produces about 40,000 tons of fish yearly.

Irrigation Farming: Farmers use lake water to grow crops during dry season when rain stops. Rice, vegetables, and other crops grow with water from lakes like Kainji and Lagdo.

Transportation: Boats and ferries move people and goods across large lakes. Lake Volta has ferry services connecting northern and southern Ghana. This is often faster and cheaper than going by road around the lake.

Tourism and Recreation: Beautiful lakes attract tourists who come for boat rides, fishing, and watching wildlife. The Kainji Lake National Park brings visitors to see animals and birds.

Problems Facing West African Lakes

Climate Change: Less rainfall and higher temperatures make lakes dry up. Lake Chad lost over 90% of its size since 1963. This affects millions who depend on the lake.

Pollution: Farms use fertilizers that wash into lakes. Factories dump waste water. This makes lake water dirty and kills fish. People can get sick from drinking polluted water.

Overfishing: Too many fishermen catching too many fish reduces fish numbers. Some use bad methods like chemicals and small nets that catch young fish before they grow.

Water Weeds: Plants like water hyacinth spread quickly on lake surfaces. They block sunlight, kill fish, and make boat travel difficult. Lake Volta struggles with water hyacinth invasion.

Siltation: Soil from farms washes into lakes and fills them up. This makes lakes shallower and reduces water storage. Cutting trees near lakes makes erosion worse.

Dam Water Release: When dams suddenly release water, it causes floods downstream. Lagdo Dam releases have caused flooding in Nigerian states many times.

Common Exam Mistakes

WAEC examiners report that students often make these mistakes when answering questions about West African lakes:

• Confusing natural and man-made lakes: Lake Chad is natural, but Lake Volta and Lake Kainji are man-made. Don’t say all lakes were created by dams.
• Wrong locations: Lake Chad touches four countries (Nigeria, Niger, Chad, Cameroon), not just Nigeria. Lake Volta is in Ghana, not Nigeria.
• Exaggerating Lake Chad’s current size: Don’t call it the “largest lake in Africa” anymore. It has shrunk dramatically and is now quite small.
• Missing the rivers that formed lakes: State which river was dammed: Lake Kainji (River Niger), Lake Volta (Volta River), Lagdo (Benue River).
• Only listing lakes without explaining importance: When asked to “explain” or “describe,” give details about size, uses, and benefits, not just names.
• Poor spelling: Practice spelling: Kainji (not Kanji), Bosumtwi (not Bosomtwi), Sassandra.

Practice Questions

Multiple Choice

1. Which of the following is the largest man-made lake in the world by surface area?
a) Lake Kainji
b) Lake Chad
c) Lake Volta ✓
d) Lagdo Reservoir

2. Lake Chad is shared by how many countries?
a) Two countries
b) Three countries
c) Four countries ✓
d) Five countries

3. The Kainji Dam was built on which river?
a) River Benue
b) River Niger ✓
c) River Volta
d) River Osun

4. What is the main reason Lake Chad has shrunk since the 1960s?
a) Building of dams
b) Overfishing
c) Climate change and overuse of water ✓
d) Pollution from factories

Essay Questions

1. State five importance of lakes to West African countries. (5 marks)

Tip: Focus on different uses – don’t repeat similar points. Think water supply, power, food, transport, tourism.

2. Explain four problems facing lakes in West Africa. (8 marks)

Tip: “Explain” means give details. Don’t just write “pollution” – explain what causes it and what effects it has. Use examples like Lake Chad shrinking or water hyacinth in Lake Volta.

3. Compare natural lakes and man-made lakes in West Africa, giving two examples of each. (10 marks)

Tip: Set up a comparison showing how they were formed, their uses, and any problems. Natural: Lake Chad, Lake Bosumtwi. Man-made: Lake Volta, Lake Kainji.

Memory Aids

Major Lakes (VKCBL): Remember the five main lakes using this phrase:
Very Kind Children Bring Love
V = Volta, K = Kainji, C = Chad, B = Bosumtwi, L = Lagdo

Lake Chad Countries: CANN = Chad, Cameroon, Niger, Nigeria

Natural vs Man-made:
Natural lakes = CBC (Chad, Bosumtwi, Crater lakes)
Man-made lakes = Built by Dams (Volta, Kainji, Lagdo, Shiroro, Asejire)

Lake Uses: FITWET
F = Fishing, I = Irrigation, T = Transportation, W = Water supply, E = Electricity, T = Tourism

Related Topics

• Rivers in West Africa
• Climate change in Africa
• Hydroelectric power generation
• Fishing industry in Nigeria
• Water pollution and conservation