Gabon's geography: a forest gaining ground on an interior its people left

Where Gabon's people live and where they do not

Gabon lies across the equator on the Atlantic side of Central Africa, between about 3°N and 4°S and between 8° and 15°E. The record gives its total area as 267,667 km² and its population as 2.3 million in 2023, which works out at about 8.6 people to the square kilometre.

Almost nobody lives at that average. Britannica counted 91.3% of the population as urban in 2024. Libreville, capital of Estuaire province, had 899,000 inhabitants at the start of 2025 on the record's figure, and the World Bank's country overview, as read in October 2026, puts nearly 59% of the population in Libreville and Port-Gentil together. Both are on the coast. Port-Gentil stands near Cape Lopez and carries the wood and petroleum industries; Libreville is the administrative capital and the commercial centre.

The rest, in Britannica's description, is spread among several hundred villages strung along the rivers and the roads, many of them no more than a few families. Between the roads the density drops close to nothing. The forest block of nearly 2,000,000 hectares around Ivindo National Park, in northern Gabon, averaged about 2.5 inhabitants per km² when UNESCO inscribed the park in 2021, and the park itself is recorded as uninhabited.

This arrangement is recent. The population fell between 1900 and 1940, and at independence in 1960 fewer than 20% of Gabonese lived in towns. Oil jobs at Port-Gentil and Gamba drew people off the land through the 1970s, and by 1988 two thirds of the population was urban. Britannica records the effect on farming: the towns emptied the countryside of its young people, and by 1980 Gabon produced enough food for only 10 to 15% of its needs.

Which countries Gabon touches

The land boundary runs to 3,261 km in the 2025 World Factbook figures, shared with three states: the Republic of the Congo to the east and south, and Cameroon and Equatorial Guinea to the north. The three published lengths add up to 3,251 km, ten short of the stated total, and no source on file accounts for the gap.

The record lists five neighbours. Two of them share no land boundary in those figures: São Tomé and Príncipe lies off the coast, and Angola is named in the record but appears in none of the boundary lengths. At sea, Gabon claims a territorial sea of 12 nautical miles and an exclusive economic zone of 200.

How Gabon climbs from the coast to the plateaux

Nothing in Gabon stands far above 1,000 metres. The land tops out at Mont Bengoué, 1,070 metres, in the north-east, and most of the interior is plateau. What the relief does have is an order: a coastal plain, then a step up to granite plateaux, then a few massifs standing out of them.

How the coast changes at Cape Lopez

The coastal plain is narrow in the south, often no more than 32 km wide on Britannica's measure, and built of sandstone and alluvium. Northward it broadens to about 160 km, with outcrops of chalk, limestone and Cretaceous sandstone. Wikipedia gives the range of the plains as 20 to 300 km from the shore, and the two sources are measuring different edges.

The Benguela Current flows north along this coast and shapes it. South of Cape Lopez, the westernmost point of the country, it builds sandbars and softens the shoreline. From the cape down towards the mouth of the Congo the coast is a chain of lagoons and bays, among them Fernan Vaz, Setté Cama, Iguela and the Banya lagoon at Mayumba, and surf and bars along it forced most ships of the Atlantic trade to anchor offshore. North of the cape the current loses its effect and the coast turns jagged, running past the Gabon Estuary to the Muni estuary on the border with Equatorial Guinea, which carries patches of Central African mangrove. The littoral north of Mayumba is backed by mangrove; farther south the shore rises higher and drier.

Where the plateaux rise into massifs

Inland, a series of granite plateaux trends north-west to south-east at 300 to 600 metres. To the west and north of them the Cristal Mountains, north-east of Libreville, have been cut by rivers out of the plateau's western escarpment into an upland of their own. South of the Ogooué, the Chaillu Massif forms the central watershed. It is granite, rises above 1,000 metres and reaches 1,020 metres at Mount Milondo. Savanna takes over from forest in parts of the east and the south.

The extreme points mark the frame. The northernmost lies on the Ntem River on the Cameroon border, in Woleu-Ntem province. The easternmost sits on the Congo border just south-west of the Congolese village of Mbeyi-Mbola, in Haut-Ogooué. The southernmost is where the Congo border meets the Atlantic, in Nyanga province, and the westernmost is the north-west tip of Cape Lopez.

What the rock under Gabon holds

Most of Gabon stands on Archaean and Palaeoproterozoic basement, igneous and metamorphic rock belonging to the Congo Craton, and some formations are more than 2 billion years old. Marine carbonates, lake and continental sediments and the soils of the last 2.5 million years lie over parts of it. Along the coast, the rifting apart of Pangaea opened basins that filled with sediment, and those sediments produced the hydrocarbons. Nearly half of the oil comes from offshore fields near Port-Gentil; the main onshore sites are Sette Cama and Rabi-Kounga.

Uranium working began 26 km north of Moanda, in the south-east, in 1961. During that mining, in the 1970s, the Oklo reactor zones were found: places where uranium in the rock sustained nuclear fission on its own about 2 billion years ago. The ore was being dug to supply the French nuclear industry.

The same south-east holds the manganese of Moanda, which expanded once the railway reached nearby Franceville in December 1986 and the ore terminal at the deepwater port of Owendo was improved in 1988. The north-east holds iron ore of 60 to 65% iron content at Mékambo and Bélinga. Diamonds and gold are also mined.

Three karst areas break the crystalline pattern. They hold hundreds of caves in dolomite and limestone, and a National Geographic expedition documented some of them in the summer of 2008.

Why the Ogooué organises the country

The Ogooué runs about 1,200 km. On its way down from the plateaux it drains through a sandstone saddle and then descends to the lowlands through the granite around Lambaréné. Five of the nine provinces carry its name: Haut-Ogooué, Moyen-Ogooué, Ogooué-Lolo, Ogooué-Ivindo and Ogooué-Maritime, whose capital is Port-Gentil.

Boats can use it from the Atlantic to Ndjolé, 240 km upstream. Above that, it and rivers such as the Abanga and the Nyanga were used to float logs down from the interior. The Orungu clans at Cape Lopez built a kingdom on control of the slave trade through the river's mouths, and the coastal Myene brokers linked the Ogooué routes and the lagoon chain to European shipping.

The river also divides people. The Fang, more than a quarter of the population in Britannica's count, live north of the Ogooué; the Sira, including the Punu, the Nzebi and the Mbete live south of it. In the middle valley around Lopé the forest thins, and UNESCO describes that open ground as a corridor that carried the Bantu migration and others along the river, with 400,000 years of almost continuous occupation behind it.

Roads have always been the difficulty. All-weather roads proved hard to build and keep open, so after the Second World War the country turned to light aircraft and a network of airfields. Air could not carry timber or ore, and in the 1970s oil revenue paid for the Transgabon railway. Work began in 1974; the line opened from Owendo to Ndjolé in 1979, to Booué in 1983 and to Franceville at the end of 1986. It opened the interior forest to logging after the timber near the coast and along the rivers had been largely cut. The government of Canada's travel advice, as published in October 2026, still warns that roads outside the towns can be impassable in the rains.

The rivers also make most of the power. Britannica names the Tchimbélé, Kinguélé and Poubara hydroelectric complexes, and hydropower supplies more of the electricity than the gas from the Port-Gentil fields. Total renewable water resources were put at 164 km³ in 2011, against 44.5 km² of irrigated land in 2003.

How the rains and the ocean set the climate

Gabon has a tropical monsoon climate over much of the country and a tropical savanna climate elsewhere, hot and humid all year. The daily average temperature sits in the upper 20s °C with little change between months, and the Benguela Current offshore can take the edge off it.

Rainfall carries the variation. Britannica gives an annual average of about 3,050 mm at Libreville and about 3,810 mm on the north-west coast, almost all of it falling between October and May. From June to September there is little or no rain, though the air stays humid. The government of Canada divides the wet months into two seasons, October to mid-December and mid-February to May, which leaves a shorter break around the turn of the year.

The rain does not fall evenly inland. The Lopé area lies in the rain shadow of the Chaillu Massif, and a band of low rainfall follows the Ogooué valley. That dry strip is why forest and savanna sit side by side there.

The coast carries the exposure. Wikipedia's summary of the climate risk names the dense coastal population and the economic centres on the shore: rising seas threaten to erode the coastline and to push saltwater into fresh water. Canada's travel advice adds that El Niño years can raise the chance of drought, flood and severe storms. In July 2026 the government declared a nationwide state of water emergency, citing low rainfall and ageing water facilities, and the supply to Libreville was affected.

Why the forest is advancing on the Lopé savannas

How much of Gabon is forest depends on who measured and how. Britannica says about three quarters of the country, dense equatorial rainforest with more than 3,000 plant species. Wikipedia's country article gives 89.3% of the land area. Global Forest Watch, counting vegetation taller than 5 metres at more than 30% canopy density, put tree cover in 2000 at 246,910 km², against a land area of 257,670 km² in the World Factbook figures.

The loss since then has been small. Global Forest Watch counts 554,641 hectares of tree cover lost between 2001 and 2024, about 2.2% of the 2000 extent, and its method does not add regrowth back. Under the UN's REDD+ framework, the forest reference level assessed in 2021, built on the years 2000 to 2009, came to minus 96,468,186 tonnes of CO2 equivalent a year, a negative figure that matches the description of the forests as a net carbon sink. In 2023 Gabon emitted 24.7 million tonnes of greenhouse gases, just over 0.04% of the world total.

At Lopé the forest is doing more than holding its ground. The park, 4,912 km² between the Ogooué to the north and the Chaillu Massif to the south, keeps the last grass savannas in the north that formed in Central Africa during the last ice age, about 15,000 years ago. Since then the rainforest has been moving into them, and the dry climate of the rain shadow has let the savanna persist in the north of the park. Wikipedia's account attributes the present advance to climate change, and the park now carries out controlled burns of the savanna every year to slow the encroachment and keep the vegetation the forest buffalo feed on.

UNESCO inscribed the area as the Ecosystem and Relict Cultural Landscape of Lopé-Okanda in 2007, Gabon's first World Heritage site, citing the meeting of forest and relict savanna and a record of 15,000 years of change in the transition zone. The same ground holds some 1,800 petroglyphs by UNESCO's count; Wikipedia gives over 1,600. The protection is older than the park: the Lopé-Okanda Wildlife Reserve, created in 1946, was the first protected area in Gabon.

The commercial forest lies elsewhere. Okoumé, a hardwood, carries the timber industry, and the main forest districts have been at Kango, Booué, Fougamou, Ndjolé, Mitzic and Mouila.

What lives in Gabon's forests and rivers

Wikipedia's country article lists 604 bird species, 98 amphibians, between 95 and 160 reptiles and 198 mammals, with more than 6,000 plant species and 400 species of tree. Chimpanzees were estimated at between 27,000 and 64,000 in 2003, and gorillas at between 28,000 and 42,000 in 1983.

Gabon holds more than half of the African forest elephants. In Minkébé National Park, in the north, the population fell by 78 to 81% between 2004 and 2014, a loss of more than 25,000 animals, mostly to poaching. At Lopé the density of forest elephants in the north of the park reaches 1.5 per km² in some seasons.

The rivers carry a fauna of their own. Ivindo National Park, inscribed by UNESCO in 2021, covers 298,758 hectares of blackwater rivers, rapids and falls. Its waters hold 45 fish species endemic to Lower Guinea, 13 of them found only in Gabon, and 16 species known from the Ivindo River alone. A swarm of about fifteen species of weakly electric fish of the genus Paramormyrops lives there, and UNESCO calls it the only river species swarm in that family anywhere. At the Kongou Falls grow seven species of Podostemaceae riverweed, 44% of the country's recorded flora of that family.

The forest of the Ivindo plateau is old in a botanical sense. Its Caesalpinioideae stands are a stage of forest development that has disappeared elsewhere in Lower Guinea, and the forests on the western edge of the park differ by 60% in composition from those on the eastern edge. The park counts 126 mammal species, 190 of the 278 forest bird species of the Guinean-Congolese region and 528 recorded species of day-flying butterfly, with UNESCO estimating 800 to 1,000 in all.

On the coast, the World Wide Fund for Nature described Gamba in 2002 as a place where elephants and gorillas cross the dunes, buffalo walk the beach and sea turtles ride the surf.

How much of Gabon is set aside

In 2002 Gabon created 13 national parks covering 3 million hectares, about 10% of the country. The announcement, made by Omar Bongo at the Johannesburg summit and confirmed in Libreville, was reported by WWF on 9 September 2002. The parks drew together five existing protected areas, Lopé, Minkébé, Monts Doudou, Moukalaba and Petit-Loango, with eight sites never classified before. Ivindo's own decree is dated 30 August 2002, and the Forestry Code of 31 December 2001 fixes a buffer zone of 5 km around each national park.

The current totals, as Protected Planet published them in October 2026, count 63 protected areas, 51 of them national designations: 13 national parks, 9 marine parks, 11 aquatic reserves and 9 Ramsar wetlands among them. They cover 22.65% of the land, 59,384 km² of a land area Protected Planet takes as 262,210 km², and 26.81% of the marine and coastal area, 53,872 km² of 200,931 km². The land area in that calculation differs from both the record's total and the World Factbook's land figure, and Protected Planet's own note puts such differences down to methods and base maps.

Gabon ratified the World Heritage Convention on 30 December 1986. Its two inscribed sites are both natural or mixed, Lopé-Okanda in 2007 and Ivindo in 2021, and six more went on the Tentative List in 2022, among them the Moukalaba-Doudou, Plateaux Batéké and Loango national parks.

Protection inside the forest has edges. Logging concessions surround much of Ivindo, two of the eleven in its buffer were certified by the Forest Stewardship Council at inscription, and each must leave a 500-metre strip intact along the park boundary. The logging tracks have already let an invasive ant into the park.