Africa has deserts larger than entire countries, lakes that rank among the deepest on Earth and geological formations visible from space. It is also the only continent crossed by both the Equator and the Tropics of Cancer and Capricorn.
Some of its most remarkable geographical features are millions of years old. Others, including parts of the East African Rift, are still changing because of movements beneath the Earth's surface.
These 23 facts cover Africa's mountains, rivers, deserts, lakes, islands and national borders, with specific locations and measurements wherever available.
1. Africa Is the Only Continent Crossed by the Equator and Both Tropics
The Equator passes through several African countries, including Gabon, the Republic of Congo, Uganda, Kenya and Somalia.
The Tropic of Cancer crosses northern Africa, while the Tropic of Capricorn crosses southern Africa.
This gives the continent an unusually broad range of tropical and subtropical environments.
Africa also extends into temperate latitudes at its northern and southern extremes.
2. The Sahara Desert Is Almost as Large as the United States
The Sahara covers approximately 9.2 million square kilometres, whereas the United States covers approximately 9.8 million square kilometres
It stretches across North Africa from the Atlantic Ocean towards the Red Sea.
Its landscape includes sand dunes, rocky plateaus, gravel plains and mountain ranges.
Despite its reputation, the Sahara is not entirely covered by sand.
3. Africa Contains the World's Largest Hot Desert
The Sahara is the world's largest hot desert.
Antarctica and the Arctic are larger deserts when deserts are classified by their low precipitation rather than temperature.
The Sahara's extreme dryness results from atmospheric circulation patterns and regional geographical conditions.
Some parts receive very little measurable rainfall during an average year.
4. Lake Tanganyika Is One of the Deepest Lakes on Earth
Lake Tanganyika reaches a maximum depth of approximately 1,470 metres.
It is generally recognised as the world's second-deepest lake after Lake Baikal in Russia.
The lake borders Tanzania, the Democratic Republic of Congo, Burundi and Zambia.
It is also one of the world's oldest major freshwater lakes.
5. Lake Victoria Is Africa's Largest Lake by Surface Area
Lake Victoria covers approximately 68,800 square kilometres.
It is shared by Uganda, Kenya and Tanzania.
The lake is the largest in Africa by surface area and one of the world's largest freshwater lakes.
It forms an important part of the Nile River drainage system.
6. The Nile Flows North Towards the Mediterranean Sea
The Nile River flows north through northeastern Africa.
Its principal tributary systems include the White Nile and Blue Nile.
The river passes through Sudan and Egypt before reaching the Mediterranean Sea.
Its total length is commonly reported at approximately 6,650 kilometres, although river-length measurements vary by source.
7. The Congo River Is the World's Deepest Known River
The Congo River is one of Africa's largest river systems.
Scientific measurements have identified depths exceeding 200 metres in parts of its channel.
It is widely recognised as the deepest known river in the world.
The Congo Basin also contains one of the world's largest tropical rainforest systems.
8. Mount Kilimanjaro Is the World's Tallest Freestanding Mountain
Mount Kilimanjaro rises approximately 5,895 metres above sea level.
It is located in northern Tanzania near the Kenyan border.
The mountain consists of three volcanic cones: Kibo, Mawenzi and Shira.
Kilimanjaro is Africa's highest mountain and is commonly described as the world's tallest freestanding mountain.
9. Africa Has a Mountain Range With Snow Near the Equator
The Rwenzori Mountains lie along the border between Uganda and the Democratic Republic of Congo.
Their highest summit, Margherita Peak on Mount Stanley, rises to approximately 5,109 metres.
The mountains contain high-altitude glaciers despite their equatorial location.
These glaciers have been shrinking as regional temperatures have increased.
10. The East African Rift Is Gradually Pulling Parts of Africa Apart
The East African Rift is a major tectonic system extending through eastern Africa.
It marks an area where sections of the African lithosphere are moving apart.
The process has created valleys, volcanoes, lakes and fault systems.
The movement occurs over geological timescales, generally measured in millimetres per year.
11. Ethiopia Contains One of the Hottest Places on Earth
The Danakil Depression in northeastern Ethiopia is known for extreme temperatures.
Parts of the depression lie below sea level.
The region contains salt flats, volcanic features and geothermal areas.
Its unusual landscape results from tectonic activity and the area's extremely arid climate.
12. The Richat Structure Looks Like a Giant Eye in the Sahara
The Richat Structure is located in Mauritania.
It forms a series of concentric geological rings approximately 40 kilometres across.
The formation is visible in satellite imagery and is sometimes called the Eye of the Sahara.
Geologists associate it with an eroded geological dome rather than an ancient impact crater.
13. Lake Natron Can Turn Red or Pink
Lake Natron is located in northern Tanzania near the Kenyan border.
It is a highly alkaline lake known for its unusual chemical conditions.
Its waters can appear reddish or pinkish because of salt-loving microorganisms and algae.
The lake is also an important breeding habitat for lesser flamingos.
14. Victoria Falls Forms One of the World's Largest Waterfall Curtains
Victoria Falls lies on the Zambezi River between Zambia and Zimbabwe.
The waterfall is approximately 1,708 metres wide.
Its maximum drop is around 108 metres.
The combination of its width and height makes it one of the world's largest sheets of falling water.
15. Africa Has a Desert That Reaches the Atlantic Ocean
The Namib Desert stretches along the Atlantic coast of southwestern Africa.
It extends through Namibia and neighbouring coastal regions.
The desert contains enormous sand dunes, gravel plains and coastal fog environments.
The meeting of dunes and ocean is particularly visible around Sandwich Harbour in Namibia.
16. Madagascar Is the World's Fourth-Largest Island
Madagascar covers approximately 587,000 square kilometres.
It lies in the Indian Ocean off southeastern Africa.
Only Greenland, New Guinea and Borneo are larger islands.
Its long geographical isolation contributed to the evolution of numerous species found nowhere else.
17. Lesotho Is Entirely Surrounded by South Africa
Lesotho is a sovereign country enclosed within South Africa.
It has no coastline and shares its only international land border with South Africa.
The country is also unusual because its entire territory lies above approximately 1,000 metres in elevation.
Its mountainous terrain distinguishes it from many other African countries.
18. The Gambia Is Shaped Around a River
The Gambia is one of mainland Africa's smallest countries.
Its territory extends along both sides of the Gambia River.
The country is surrounded by Senegal except for its short Atlantic coastline.
Its elongated geographical shape reflects historical colonial boundary arrangements.
19. Africa Has Three Countries With Capitals Above 1,500 Metres
Addis Ababa, Ethiopia, lies at an elevation of approximately 2,350 metres.
Nairobi, Kenya, stands at roughly 1,795 metres.
Asmara, Eritrea, is located at approximately 2,325 metres.
These high elevations contribute to climatic conditions that differ from nearby lower-altitude regions.
20. The Okavango Delta Does Not Flow Into the Ocean
Botswana's Okavango Delta is an inland river delta.
Water from the Okavango River spreads across the Kalahari Basin.
Much of the water eventually evaporates or is absorbed into the landscape.
The delta supports extensive wetland ecosystems in an otherwise relatively dry region.
21. Africa Has an Active Volcano With a Lava Lake
Mount Nyiragongo is located in the Democratic Republic of Congo.
The volcano is known for its history of persistent lava-lake activity.
It rises to approximately 3,470 metres above sea level.
Nyiragongo has experienced major eruptions, including destructive events in 2002 and 2021.
The presence and condition of its lava lake change over time.
22. The Red Sea Is Part of an Active Tectonic Boundary
The Red Sea separates northeastern Africa from the Arabian Peninsula.
It occupies a region where tectonic plates are moving apart.
The Red Sea basin has developed through millions of years of geological activity.
Its coastal waters are also known for coral reefs and marine biodiversity.
23. Africa Is the World's Second-Largest Continent
Africa covers approximately 30.3 million square kilometres, including its islands.
Only Asia has a larger land area.
The continent contains 54 widely recognised sovereign countries.
Its total area represents roughly one-fifth of the Earth's land surface.
Africa's Geographical Extremes
Africa contains the Sahara, the world's largest hot desert, and the Congo Basin, one of the planet's largest tropical rainforest regions.
Its highest mountain is Kilimanjaro, while Lake Tanganyika is among the world's deepest freshwater lakes.
The continent also contains unusual political geography, including the enclosed kingdom of Lesotho and The Gambia's narrow territory along its namesake river.
Many of Africa's geographical features remain active geological systems, particularly the East African Rift and the volcanic regions associated with it.
