The Central African Republic's geography: the plateau that parts the water

Why the colony carried the names of two rivers

The colony of Ubangi-Shari was established on 29 December 1903 out of two territories of the French Congo, the Upper Ubangi and the Upper Shari, and it took its name from the rivers along which it had been occupied. The Ubangi is a tributary of the Congo. The Chari gathers the northern tributaries and carries them towards Lake Chad. A colony named for both was a colony defined by a watershed, and the name was an accurate description of the ground before it was anything else.

The French approach followed the water in each direction. An outpost called Bangi was set up in 1889 at the head of navigation on the Ubangi, the farthest point river boats from the Congo could reach. In 1890 and 1891 Savorgnan de Brazza sent expeditions up the Sangha in the south-west, up the middle of the Ubangi basin towards Lake Chad, and east along the Ubangi towards the Nile. Those three lines of advance are the three river systems the territory touches, and every later border argument was an argument about which of them France would hold.

The record of those arguments is written in basins. An 1887 convention with the Congo Free State gave France the right bank of the Oubangui. In 1899 the border with Sudan was fixed along the Congo-Nile divide, which left France without the outlet on the Nile it had wanted. The colony was joined to the French settlements around Lake Chad in 1906 and lost that territory again in 1920. In 1911 the Sangha and Lobaye basins in the west were ceded to Germany, and France took them back after the First World War. The history article follows those years in full; for the land itself, what matters is that the outline was drawn river by river.

The name changed on 1 December 1958, when the territory became the Central African Republic. The new name also came from the map, from the country's position in Central Africa, and the World Factbook's note on the geography puts it at almost the precise centre of the continent.

Where the crest divides Chad water from Congo water

Britannica describes the whole country as an immense rolling plateau, and the feature that organises it is the crest along its middle. That crest trends from south-west to north-east and forms the drainage divide between the Lake Chad basin and the Congo basin. Tributaries of the Chari occupy the northern third of the territory. The remaining two thirds drain south into the Ubangi, which forms the southern border with the Democratic Republic of the Congo.

The southern system is assembled along the border. In the east the Mbomou merges with the Uele to form the Ubangi, so much of the southern frontier is a river before it is anything else. In the west the Sangha flows through part of the country on its way south to the Congo. On the far side, the eastern border lies along the edge of the Nile watershed. Three great drainage basins therefore meet the territory, and one of them, the Nile, only touches its eastern rim.

Most of the plateau lies at about 500 metres. The record gives the lowest point as the Ubangi River at 335 metres and the highest as Mont Ngaoui at 1,410 metres, so the whole relief of a country of 622,984 square kilometres spans 1,075 metres. Nowhere in it falls below the level of the river that drains it.

Water is not short in the ground. The World Factbook, as reproduced in Wikipedia's geography article, gives total renewable water resources of 144.4 cubic kilometres in 2011. Withdrawals were 0.07 cubic kilometres a year, 83% of it for domestic use, and 17.42 cubic metres per person in 2005. Irrigated land measured 1.35 square kilometres in 2003. The same source lists floods as common and tap water as not potable, and the geography article states that about a third of the population has no access to clean water.

How the plateau rises towards its edges

The central plains are almost level, and the high ground sits on the margins. Britannica traces it round the compass. In the north-east the plains rise gradually to the Bongos Massif, which reaches 1,330 metres at Mount Toussoro, and to the Tondou Massif in the east. In the north the Dar Challa range rises to 1,326 metres at Mount Ngaya, near the Sudanese border. In the west the plains climb to the granite range of the Karre Mountains, which reach 1,410 metres at Mont Ngaoui before declining eastward into sandstone plateaus. The south-east is a plain cut by a number of rivers.

Wikipedia adds the Fertit Hills in the north-east and scattered hills in the south-west, and it gives two figures for one massif. Its geography article calls the Karre Mountains the Yade Massif, a granite plateau at 1,143 metres. Its main country article gives the Yade Massif an altitude of 348 metres and 1,143 feet in the same sentence, which is the same height with the units swapped, since 1,143 feet is about 348 metres. The geography article's reading fits Britannica's account of a granite range climbing to 1,410 metres, and it is the one this page uses.

The surface between those edges carries smaller features. UNESCO's description of Manovo-Gounda St Floris, inscribed in 1988, records plains interspersed with small granite inselbergs and, to the south, the rugged sandstone massif of the Bongos. Wikipedia places the focal point of the Bangui magnetic anomaly, a disturbance in the Earth's magnetic field, in the capital itself.

The extreme points mark out a territory between latitudes 2° and 11° north and longitudes 14° and 28° east. The northernmost point is an unnamed spot in the Aoukal river on the border with Chad, in Vakaga Prefecture. The southernmost is the tripoint with Cameroon and the Republic of the Congo, in Sangha-Mbaéré. The easternmost lies just east of the tripoint with South Sudan and the Democratic Republic of the Congo, south of the South Sudanese town of Ezo, and the westernmost sits on the Cameroonian border west of Koundé, near the road from Lokoti to Garoua-Boulaï.

Which borders follow a river or a watershed

The 2025 edition of the World Factbook gives the land boundary as 5,920 kilometres, shared with the six neighbours the record lists, and no coastline at all.

The border with the Democratic Republic of the Congo, at 1,747 kilometres in the 2025 edition, is 29.5% of the total, and much of it is the Mbomou and the Ubangi. The water that crosses the southern frontier therefore runs along it, and the border with Chad, at 1,556 kilometres, sits on the Chari side of the divide.

The figures for the size of the country are not quite settled either. The record gives 622,984 square kilometres, the figure Wikipedia and the Factbook also print. Protected Planet, the database kept by UNEP-WCMC and IUCN, measured the total land area at 619,798 square kilometres in October 2026, and its own note explains why such numbers differ: each database uses different base maps.

The Factbook lists the Central African Republic as party to the conventions on biodiversity, climate change, desertification, wetlands and tropical timber, and as a signatory that has not ratified the Law of the Sea.

When the rains arrive and the harmattan returns

Most of the country has a tropical savanna climate, Köppen Aw. There are areas of tropical monsoon climate, Köppen Am, in the south, and a hot semi-arid climate, Köppen BSh, in the north. The year is divided into a wet season and a dry season, and it is hot through both.

The wet season comes from the south-west on monsoon winds. Britannica puts it from March to October or November, with heavy rainstorms almost daily and early morning fog. Maximum annual precipitation is about 1,800 millimetres, falling in August and September in the upper Ubangi region, and the Karre Mountains average about 1,500 millimetres. Daily temperatures in the wet season run from 19 to 30 °C.

The sources disagree about the dates, and the disagreement is itself a description of the country. Britannica gives March to October or November. Global Affairs Canada gives May to October and adds that the season shortens northward to four months, June to September. Wikipedia's country article gives June to September in the north and May to October in the south. The UK Foreign Office warns that roads outside Bangui can become impassable from May to November. A country reaching from 2° to 11° north does not have one rainy season. It has a season that arrives earlier and lasts longer the nearer a place is to the Ubangi.

The dry season comes on the north-east trade wind, the harmattan, which Britannica dates from October to February or March. The air is dry and the skies are generally clear, and temperatures range between 18 and 40 °C, warm by day and markedly cooler at night. Sandstorms and dust storms reach the extreme north. The Factbook lists the harmattan and desertification as the hazards of the northern areas, and Wikipedia describes the far north-east as steppe.

Rain reshapes movement every year. The economy article on Wikipedia states that river traffic on the Oubangui is impossible from April to July, and Global Affairs Canada warns that dirt roads may be impassable for several days at a time in the wet months. Between them the two seasons can close the river and the roads in turn.

How savanna gives way to rainforest in the south

The vegetation follows the rain. Britannica places most of the country in Africa's savanna zone, with a treeless north and dense tropical rainforest in the south, particularly along the Ubangi and the Sangha. Between the two the savanna ranges from scrubby, drought-resistant and fire-resistant trees to gallery forest along rivers and streams. Wikipedia counts six terrestrial ecoregions: Northeastern Congolian lowland forests, Northwestern Congolian lowland forests, Western Congolian swamp forests, East Sudanian savanna, the Northern Congolian forest-savanna mosaic and the Sahelian Acacia savanna.

How much of that is forest depends on who is counting. Wikipedia gives forest cover of about 36% of the land in 2020, 22,303,000 hectares, down from 23,203,000 hectares in 1990. Planted forest made up 2,000 hectares of it in 2020, and 9% of the naturally regenerating forest was primary forest. In 2015, 91% of the forest area was in public ownership. Global Forest Watch measures something else, tree cover, which is any vegetation taller than 5 metres. At a canopy density above 30% it found 47,073,506 hectares of tree cover in 2000, about three quarters of the country, and a cumulative loss of 1,076,630 hectares from 2001 to 2024, about 2.3% of that baseline. The gap between 36% and three quarters is a matter of definition, and none of the sources reconciles the two.

The 2018 Forest Landscape Integrity Index gave the country a mean score of 9.28 out of 10. The forests contain commercially important species of Ayous, Sapele and Sipo. Wikipedia reports that the rate of deforestation rose by 71% in 2021.

Very little of the land is worked as fields. The Factbook's land-use estimate for 2012 gives arable land at 2.89% and permanent crops at 0.13%, with 96.98% of the territory in neither.

Britannica's account of the wildlife splits along the same line as the vegetation. The savannas hold many species of antelope along with baboons, buffalo and elephants. The forests hold forest elephants, smaller than the savanna animals, together with gorillas, chimpanzees and other primates, leopards and the endangered bongo antelope. The rivers carry crocodiles, hippopotamuses and many species of fish. Black rhinoceroses, once numerous, are now rare after overhunting. Britannica also notes that both timber harvesting and diamond mining take place in locations that are centres of high biodiversity, and that conflicts broke out in the 1990s between state agencies, logging companies, artisanal miners, conservation organisations and villagers looking for work with the logging companies, over how to protect those resources and raise exports at the same time.

What the two World Heritage parks protect

The country's two natural World Heritage sites sit on opposite sides of the vegetation line, one in the northern savanna and one in the south-western forest. Protected Planet counted 14.85% of the land, 92,062 square kilometres, under some form of protection in October 2026, and management effectiveness had been evaluated on 5.73% of it.

How Manovo-Gounda St Floris covers the savanna

Inscribed in 1988, the park covers 1,740,000 hectares in the north-east. UNESCO's description has it straddling the Sudano-Sahelian and Sudano-Guinean zones and enclosing the entire watershed of three rivers, the Manovo, the Koumbala and the Gounda, with grassy floodplains and wetlands. About 57 species of mammals have been recorded there, including black rhinoceros, elephant, hippopotamus, lion, leopard, cheetah and wild dog, and the red-fronted gazelle is at the southern limit of its range. Some 320 species of birds have been recorded, at least 25 of them raptors, and the shoebill has been observed.

The park is almost surrounded by the Ouandija-Vakaga and Aouk-Aoukalé game reserves, of 480,000 and 330,000 hectares, and with other hunting areas the connected protected ground reaches 80,000 square kilometres. UNESCO records that nomadic pastoralists from Nyala in Sudan and from Chad bring 30,000 to 40,000 head of cattle into the park every winter, the dry-season halt on their seasonal routes, and it names poaching and grazing as the threats.

Where Sangha Trinational joins three forest parks

Inscribed in 2012, Sangha Trinational joins three contiguous national parks where Cameroon, the Central African Republic and the Republic of the Congo meet: Lobéké, Dzanga-Ndoki and Nouabalé-Ndoki, a legally defined 746,309 hectares. Dzanga-Ndoki is in two units, connected through the Dzanga-Sangha Forest Reserve inside a buffer zone of 1,787,950 hectares. UNESCO records forest elephants, western lowland gorillas, chimpanzees, sitatunga and bongo, along with goliath tigerfish in the rivers and the critically endangered mukulungu tree. It also records that in the Central African Republic local resource use, including hunting and gathering by the BaAka, is not permitted inside the protected areas.

The Tentative List the country filed in 2006 adds three natural places to the two inscribed: the falls of the Mbi, the Mbaéré-Bondingué integral reserve, and the hill and plain of Bangui on the Oubangui, listed together with the city's colonial buildings.

Why Bangui stands at the head of river navigation

The capital sits where the plateau meets the river it drains into. Britannica describes Bangui on the bank of the Ubangi, founded as a French trading post in 1889, and the record counted 889,231 people there on 1 January 2020. The site was chosen for the river. Upstream of it, boats from the Congo could not continue.

That one river is still the main way out. Britannica describes the Ubangi and middle Congo as the normal international transport link, navigable for most of the year from Bangui to Brazzaville, from where goods go by rail to the Atlantic port of Pointe-Noire. In its entry as read in 2026, Britannica says about five-sevenths of international trade travels by river, and that of about 7,000 kilometres of inland waterway some two-fifths can be navigated. The country has no railway. Britannica gives about 600 kilometres of paved road and Wikipedia's economy article gives 429, and fuel arrives either by barge on the Oubangui or by truck through Cameroon. Plans to connect Bangui by rail to the Transcameroon Railway have been on paper since at least 2002. Much of the electricity comes from hydroelectric plants at Boali.

The population is thin across all of it. The record counted 5,152,421 people on 1 January 2023, which on 622,984 square kilometres is about 8.3 people per square kilometre. Wikipedia gives 1,232,000 for 1960. The Aka, whose ancestors Britannica takes to be the earliest inhabitants, live in the western and southern forests, and the area has been settled for at least 8,000 years: diamond prospectors have found polished flint and quartz tools of that age. The emptiness of the north-east has a dated cause as well as a dry one. Wikipedia records that much of the eastern half of Ubangi-Shari was depopulated by slave trading by local rulers between about 1900 and 1910, and UNESCO still describes the country around Manovo-Gounda St Floris as sparsely populated.