Location and scale
Nigeria sits on the Gulf of Guinea in West Africa, with a total area of 923,768 km², of which 910,768 km² is land and the remainder inland water S1. It shares land borders with Benin to the west (809 km), Niger to the north (1,608 km), Chad to the northeast (85 km), and Cameroon to the east (1,975 km), and it holds an 853 km Atlantic coastline along its south S1. The Cameroon border is by far the longest of the four, reflecting how much of Nigeria's eastern edge runs along the Mandara Mountains and Adamawa highlands rather than open plain S1
Relief: three broad belts
The country's terrain is often described in three tiers running roughly west to east and low to high: southern lowlands that merge into a broad belt of central hills and plateaus, with mountains rising along the southeast and open plains spreading across the far north S1. The southern lowlands include the coastal mangrove and freshwater-swamp fringe before the land rises inland into the hill country of the Yoruba highlands and the Niger-Benue trough S1. Nigeria's highest point, Chappal Waddi, reaches 2,419 m on the Mambilla Plateau near the Cameroon border, part of the same Adamawa highland system that continues into Cameroon along much of the eastern frontier S1. Mean elevation across the country is a modest 380 m, consistent with a landscape dominated by plateau and lowland rather than sustained mountain chains S1
Rivers and drainage
Nigeria's drainage is organised overwhelmingly around a single system: the river niger enters the country from the northwest and is joined by its major tributary, the river benue, at Lokoja in Kogi State, after which the combined flow continues south as the Lower Niger before fanning into the Niger Delta on the Gulf of Guinea S1S4. This Niger-Benue system and its tributaries — including the Kaduna, Sokoto, Gongola, and Anambra rivers — drain the great majority of the country and have historically shaped where farming, fishing, and river trade have concentrated, particularly through the seasonal flood advisories the Nigeria Hydrological Services Agency issues each year for states along both rivers' banks S5. The National Inland Waterways Authority manages roughly 10,000 km of navigable inland waterway built substantially on these two rivers and their connecting channels, providing water access to 28 of Nigeria's 36 states and to five neighbouring countries S3
Vegetation belts and climate
Running in broad east–west bands parallel to the coast, Nigeria's ecological zones — detailed further in nigeria vegetation belts and nigeria climate zones — shift from a forest belt of mangrove, freshwater swamp, and lowland rainforest in the south, through derived and Guinea savanna across the middle of the country, to Sudan and Sahel savanna in the far north, a gradient the UN Food and Agriculture Organization ties directly to a rainfall decline from over 1,600 mm (and beyond 2,500 mm in the delta) near the coast to as little as 250–500 mm in the Sahel zone S2. This belt structure is also a dry-season gradient: the forest zone's roughly three-month dry season stretches to five to seven months across the Sudan zone and seven to eight months in the Sahel, a pattern that maps closely onto the homelands of peoples such as the Hausa and Fulani of the savanna and Sahel north (see hausa people) and the Igbo of the southeastern rainforest belt (see igbo people) S2
Coasts, the delta, and environmental pressure
The Niger Delta, where the Niger River's distributaries meet the Atlantic, hosts Africa's largest mangrove forest and spans wetlands of more than 100,000 km² across several southern states, forming both an ecological asset and the physical setting for Nigeria's oil and gas industry S6. Mangrove cover in the wider delta fell from about 10,515 km² to 8,240 km² between 2010 and 2020, a loss researchers and Niger Delta communities attribute chiefly to oil spills — over 6,000 recorded in the preceding decade — alongside logging and the spread of invasive nipa palm S6. Communities such as the Ogoni of the delta, whose livelihoods depend on fishing and mangrove harvesting, have documented both the damage and, more recently, organised replanting efforts that have restored millions of mangrove seedlings with survival rates as high as 80–96% in some sites S6. These coastal pressures sit alongside a separate but related hazard inland: seasonal river flooding, which the Nigeria Hydrological Services Agency now forecasts annually and which in recent years has put tens of millions of Nigerians in floodplain communities at risk S5
Political geography built on physical geography
Nigeria's 36 states and the Federal Capital Territory are grouped into six geopolitical zones — North-Central, North-East, North-West, South-East, South-South, and South-West — a classification that, while administrative rather than physical, tracks the country's underlying relief and vegetation belts closely: the three northern zones sit predominantly on savanna and Sahel terrain, while the three southern zones span the rainforest and coastal belts either side of the lower Niger, an alignment of physical and political geography that recurs throughout Nigeria's regional history, from the pre-colonial savanna states of the sokoto caliphate in the far northwest to forest-belt kingdoms such as the kingdom of benin and oyo empire further south S1S2