Ghana occupies 238,533 square kilometers on West Africa's Atlantic coast, positioned between latitudes 4° and 12°N and longitudes 4°W and 2°E. The country's southern border meets the Gulf of Guinea across 539 kilometers of coastline, while land boundaries touch Côte d'Ivoire to the west, Burkina Faso to the north, and Togo to the east. The Republic of Ghana extends roughly 672 kilometers from north to south at its longest axis, with maximum east-west width reaching approximately 536 kilometers. This compact geography contains four distinct ecological zones: coastal savanna and mangrove systems along the Atlantic, tropical rainforest in the southwest and south-central regions, transitional woodland across the middle belt, and Sudan savanna dominating the northern third. Elevation ranges from sea level at the Gulf of Guinea to 885 meters at Mount Afadjato in the Eastern Region, creating relatively gentle topography compared to West Africa's more mountainous nations.
The Volta River system dominates Ghana's hydrology and provides the organizing structure for much of the country's physical geography. The main Volta River forms from the confluence of the Black Volta and White Volta rivers, both of which originate in Burkina Faso and flow southward through Ghana's northern and central regions. The Black Volta marks much of Ghana's western border with Côte d'Ivoire before turning eastward, while the White Volta enters from the northeast and drains the Upper East and Upper West Regions. The Oti River, another major tributary, flows from Togo and joins the Volta system from the east. Construction of the Akosombo Dam between 1961 and 1965 impounded the Volta River approximately 100 kilometers north of the coast, creating Lake Volta at 8,502 square kilometers—the world's largest reservoir by surface area and fourth-largest by volume at full capacity. The lake extends roughly 400 kilometers north-south, flooding the original Volta River valley and numerous tributary valleys, creating a dendritic shoreline exceeding 4,800 kilometers in length. A second dam at Kpong, 25 kilometers downstream from Akosombo, was completed in 1982, creating a smaller reservoir that regulates water release for hydroelectric generation and downstream uses.
Independent coastal river systems drain the southwestern and central portions of Ghana directly to the Atlantic Ocean. The Pra River, approximately 240 kilometers long, drains much of the Western and Central Regions, flowing through former gold mining areas before reaching the ocean near Shama. The Ankobra River runs parallel to Ghana's western border, draining rainforest areas and entering the Gulf of Guinea west of Axim after a course of about 190 kilometers. The Tano River forms portions of the Ghana-Côte d'Ivoire border before flowing entirely through Côte d'Ivoire to reach the ocean, though its upper basin drains Ghana's Brong-Ahafo Region. The Birim River, a tributary of the Pra, drains the Eastern Region including diamond-bearing areas around Akwatia. The Densu River drains portions of the Greater Accra Region, flowing southward through the Shai Hills before reaching the ocean west of Accra near Bortianor. These coastal rivers maintain year-round flow in their lower reaches but experience significant seasonal variation, with peak discharge during the major rainy season from April to June in southern Ghana.
Lake Bosomtwe occupies a meteorite impact crater in the Ashanti Region, located approximately 30 kilometers southeast of Kumasi. The lake measures about 10.5 kilometers in diameter with surface area of roughly 49 square kilometers, making it Ghana's only significant natural lake. The crater formed approximately 1.07 million years ago when a meteorite estimated at one kilometer diameter struck the location, creating a bowl-shaped depression now filled to depths reaching 80 meters. The lake has no surface outlet; water exits only through evaporation and slow seepage through the crater walls. This closed hydrology creates distinctive chemistry with elevated salinity and unique biological characteristics. Twenty-three villages occupy the crater rim, and the lake holds sacred status in Ashanti tradition. Fishing occurs using traditional wooden planks called padua rather than boats, following cultural protocols. Scientific coring of lake sediments provides climate records extending over one million years, making Lake Bosomtwe a significant site for paleoclimate research in West Africa.
Ghana's topography consists primarily of plains and low plateaus with limited mountainous terrain. The Kwahu Plateau extends across the Eastern Region at elevations between 450 and 762 meters, forming the most prominent upland feature in southern Ghana. This escarpment runs roughly northeast to southwest for about 240 kilometers, creating the divide between the Volta Basin to the north and east and coastal river systems to the south and west. Mount Afadjato, Ghana's highest point at 885 meters, rises in the Agumatsa Range near the border with Togo in the Volta Region, approximately 178 kilometers northeast of Accra. The summit lies within Agumatsa Wildlife Sanctuary and can be reached by hiking trail from Liati Wote village. The Gambaga Escarpment in the Northern Region forms a more gradual topographic feature, rising from the White Volta basin at approximately 150 meters elevation to plateau surfaces around 300 meters. The Atewa Range in the Eastern Region reaches elevations near 750 meters and harbors high-biodiversity forest ecosystems. The Togo-Atakora mountain chain enters Ghana's eastern border, creating modest relief in the Volta Region with peaks generally between 500 and 700 meters. Western Ghana's topography remains predominantly flat to gently rolling, with elevations rarely exceeding 300 meters outside the plateau areas.
The Gulf of Guinea coastline extends 539 kilometers from the Tano River mouth near the Côte d'Ivoire border eastward to the Volta River mouth near Ada, then continuing along the Keta Lagoon barrier system to the Togo border. Sandy beaches dominate most of the shoreline, backed by coconut palms and coastal scrub vegetation. Rocky headlands protrude at Cape Coast, Elmina, and several other locations where castle fortifications were constructed during the colonial period. Coastal morphology reflects the interaction of Atlantic swells approaching from the southwest with longshore drift moving sand and sediment from west to east. This sediment transport creates barrier beaches, spits, and lagoon systems, particularly in the Central and Volta Regions. Keta Lagoon, the largest coastal lagoon, extends approximately 30 kilometers east of the Volta River mouth, separated from the ocean by a sandy barrier beach typically 100 to 400 meters wide. The Volta River delta, modified by dam construction upstream, distributes sediment across multiple distributary channels. Coastal erosion affects numerous communities, particularly around Keta where the barrier beach has been breached repeatedly, and near Ada where river sediment supply has decreased since dam construction. The coastal zone includes extensive mangrove systems in the lagoons and estuaries, with species including Rhizophora racemosa, Avicennia germinans, and Laguncularia racemosa forming dense stands where freshwater and saltwater mix.
Climate patterns divide Ghana into distinct zones based on rainfall distribution and intensity. Southern Ghana experiences a bimodal rainfall regime with major rains from April to June and minor rains from September to November, separated by a short dry season in August and a longer dry season from December to March. Annual rainfall in the coastal zone ranges from 750 millimeters in the Accra plains to over 2,000 millimeters in the southwestern corner near Axim. The forest zone receives between 1,500 and 2,100 millimeters annually, supporting closed-canopy tropical forest where not cleared for agriculture. Northern Ghana experiences a unimodal rainfall pattern with a single wet season from April to October and a pronounced dry season from November to March. Annual totals decrease northward from approximately 1,100 millimeters in the transitional zone to 900 millimeters in the Sudan savanna of the Upper Regions. Temperature varies less with season than with latitude, ranging from mean daily temperatures of 26-28°C on the coast to 28-30°C in the northern savanna. The Harmattan, a dry dusty wind from the Sahara, affects all of Ghana during the dry season but impacts the northern regions most severely from December to February, reducing visibility and creating substantial diurnal temperature variation.