Angola's geography: a dry coast below a rain-fed plateau

How the land climbs from the Atlantic

Angola covers 1,246,700 square kilometres and is roughly square, about 1,300 kilometres across at its widest if the Cabinda exclave is counted. It has 1,600 kilometres of Atlantic coast, and its land borders run for 5,369 kilometres.

The shape of the land is a staircase with a long landing. A coastal plain of alluvium, chalk and sand runs the length of the coast, about 200 kilometres wide in the Cuanza valley south of Luanda and only 25 kilometres wide near Benguela. It rises from the sea in low terraces. Between 20 and 100 kilometres inland it meets a belt of escarpments and cuestas running parallel to the shore, and the Cuanza River divides that belt in two. North of the river the hills climb gradually, to an average of about 500 metres. South of it they rise sharply into one high escarpment that runs on through Namibia, steepest in the far south in the Serra da Chela.

Behind the escarpment lies the planalto, the high plateau, between 1,200 and 1,800 metres over most of its surface. It is flat or rolling and dominates the country's terrain. Crystalline Precambrian rock comes to the surface along the escarpment, where erosion has cut deep and laterite is common, and mineral deposits sometimes lie close to the surface there.

Why the coast gets so little rain

Rainfall is what separates one Angolan climate from another. The rain-bearing intertropical convergence zone moves with the seasons, and the Benguela Current runs cold up the coast from the south, so rainfall drops quickly towards the south and towards the sea. At any latitude the interior gets more than the coast, and the total climbs with altitude.

The rainy season runs from September to May in the north and from December to March in the south, according to Britannica, while the dry season, the cacimbo, often opens with a heavy morning mist. Temperatures vary much less than rain. Soyo, at the mouth of the Congo, averages about 26 °C over the year and Huambo about 19 °C by Britannica's figures, and in July and August, the coolest months, frost can form on the high ground. Droughts strike most often in the south, which has had several severe ones in the last decade.

South of Benguela the coast becomes the northern end of the Namib Desert, with sand dunes in the far south and dry scrub along the middle coast. The desert's best-known plant is the tumboa, Welwitschia mirabilis, which has a deep taproot and two broad flat leaves about three metres long lying on the ground. The same cold current that dries the land feeds the sea: marine life is richest along the southern coast, where temperate species come north with it.

What the coast holds below and offshore

The coastline is flat for most of its length, broken by occasional low cliffs and bluffs of red sandstone. It has four natural harbours at Luanda, Lobito, Moçâmedes and Tômbua, and one deep inlet, the Baía dos Tigres in the far south. Lobito Bay has water deep enough for large ships to unload close inshore, and the Benguela Railway, begun there in 1902, climbs from it over the escarpment to the plateau and on to the Congolese border. Along the middle coast the sea is shallower, with many small bays, and Wikipedia's account of the Bakongo names the Solongo of the dry northern coastal plain and the Ashiluanda of Luanda Island as the country's only African sea fishermen.

The coastal plain is also the only part of Angola with fossil-bearing rock. Its Cretaceous and Tertiary beds were laid down as the South Atlantic opened between the Early Cretaceous and the Eocene, and under the northern two-thirds of the plain they contain oil. Petroleum was first found there in 1955. Some onshore production comes from near Soyo and Luanda, but most of the oil lies offshore, within an exclusive economic zone of 518,433 square kilometres. A line of bare basalt hills stands between Benguela and Moçâmedes, and gypsum, copper and sulphur occur in the sandstones at Dombe Grande near Benguela.

The Benguela Current makes the southern waters some of the richest fishing grounds in Africa by Britannica's account: sardines, mackerel, tuna and mullet, with crabs, lobsters and prawns. Namibe is the fishing port of the south. Before independence about 700 vessels fished these waters and employed some 13,000 people, and by the early 1980s fewer than a seventh of them were working, because most had been owned by Portuguese who sailed them away in 1975.

What the Bié Plateau holds

The Bié Plateau, east of Benguela, is a rough quadrilateral of land above 1,500 metres covering about a tenth of Angola. Its highest ground is Mount Moco near Huambo, given as 2,620 metres by Britannica and 2,619 metres in the country record. The Malanje highlands to the north are lower and smaller, rarely above 1,000 metres, and the Huíla plateau in the south is smaller again but climbs steeply to about 2,300 metres, with the Humpata highland around Lubango reaching 2,500 metres and more.

These highlands are where rural Angola lives. Britannica puts about half the country's rural population on the Bié Plateau alone, and the plateau around Huambo, the Malanje highlands and the country around Lubango have long been among the most densely settled parts of the country. Fertile land is limited to such places and to the river valleys, and less than a tenth of the land is thought to be arable. In the north and centre people live in villages, and in the cattle country of the south in dispersed settlements, moving with their herds in search of pasture.

Where the rivers of the plateau go

A watershed called the Lunda Divide runs across the plateau and sends the rivers in four directions. North of it the Cuango and many smaller streams flow out of Angola to the Congo basin. The Cuanza, about 1,000 kilometres long and entirely inside the country, drains the centre: it runs north for about half its length, turns west through a break in the escarpment between the Malanje highlands and the Bié Plateau, and reaches the sea about 65 kilometres south of Luanda. It is navigable for nearly 200 kilometres from its mouth.

The Cunene heads south, turns west, breaks through the escarpment at the Ruacana Falls and then marks the border with Namibia to the Atlantic. In the south-east, rivers flow to the Zambezi, which crosses the far eastern Cazombo region, and to the Cubango, which becomes the Okavango on the Namibian border and ends in the Okavango Delta in Botswana. Angola, Botswana and Namibia manage that river system together, and in 2025 Angola added the Cubango-Okavango catchments to its UNESCO Tentative List. Several southern rivers are seasonal and dry for much of the year.

Where the rivers drop off the escarpment they also make Angola's power. Most electricity comes from dams on the Cuanza, Cunene, Catumbela and Dande at the points where they break through to the coastal plain.

Why the east is almost empty

East of the highlands the plateau loses height slowly across two-thirds of the country and falls to between 500 and 1,000 metres at the eastern border. Most of it lies under deep deposits of infertile windblown Kalahari sand. Britannica describes this eastern country, together with the semi-desert coast, as almost empty at the start of the century, and the 2024 census bears it out: Moxico Leste counted 411,074 people and Cuando 138,770, against 8,665,510 in Luanda province.

The north-east is the exception. The river gravels there carry alluvial diamonds, and rare kimberlite pipes occur in the same country; Lunda Norte, which holds the principal diamond mines, counted 1,742,217 people in 2024. At the Catoca diamond mine the rock preserves dinosaur, mammal and crocodile-relative tracks about 128 million years old.

How Cabinda came to lie apart

Cabinda, the northernmost province, is separated from the rest of Angola by a strip of the Democratic Republic of the Congo about 60 kilometres wide along the lower Congo River. It covers about 7,290 square kilometres and borders the Republic of the Congo to the north and the Democratic Republic of the Congo to the east and south. Portugal took it under the Treaty of Simulambuko with the princes of Cabinda in 1885, and it was made part of Angola in 1975.

Most of it is tropical forest. The Maiombe forest in the north receives about 1,800 millimetres of rain a year and holds the most valuable commercial timber, white tola and limba, along with gorillas and chimpanzees. Angola's oil and gas reserves are concentrated in the sea off Cabinda and the Congo estuary. The census of 2024 counted 903,370 people in the province.

Where Angolans live according to the census

The 2024 census counted 36,604,682 people in 21 provinces, and the provinces reflect the terrain. Luanda province alone held 23.7% of the population in 2024. Among the highland and central coastal provinces, Huíla counted 3,302,866, Huambo 2,691,902, Benguela 2,597,638 and Cuanza Sul 2,327,981. About half the population lives near the coast, which makes rising sea levels a risk to a large share of it.

Luanda's weight is recent. At the end of the colonial period more than four-fifths of the population was rural, and by the start of the 21st century about three-fifths. War drove people to the capital, and Luanda passed two million by the mid-1990s while many towns on the plateau and in the east were destroyed. About two-thirds of Angolans were counted in urban areas in 2024.

What grows and lives on the land

Most of Angola is savanna, from forest mosaic in the north to thorn scrub in the south, and fire is frequent enough that most tree species resist it. Rainforest once covered more ground, in northern Cabinda, on the western edge of the Malanje highlands and along rivers in the north-east, and farming and logging have cut it back. How much forest remains depends on the definition: Wikipedia's figures give forest cover of about 53% of the land in 2020, 66.6 million hectares against 79.3 million in 1990, while Britannica describes nearly a fifth of the country as forested.

The animals are those of the African savanna: elephants, hippopotamuses, giraffes, zebras, buffalo, lions, leopards and many antelopes. Hunting controls broke down during the civil war. The giant sable antelope of the south is particularly vulnerable, and the African wild dog is now considered extinct in the country. Iona National Park in the far south and Quiçama National Park just south of Luanda are the best known of about a dozen parks and reserves.

The climate is warming. Angola's average annual temperature has risen by 1.4 °C since 1951, rainfall is becoming more variable, and the interior and east are expected to heat faster than the coast. How the oil under the coast and the water off the escarpment are used is the subject of Angola's economy.