Volta Basin

Ghana is a West African country in Africa, along the Gulf of Guinea.

Ghana encompasses plains, low hills, rivers, Lake Volta, the world's largest artificial lake, Dodi Island and Bobowasi Island on the south Atlantic Ocean coast of Ghana. Ghana can be divided into four different geographical ecoregions. The coastline is mostly a low, sandy shore backed by plains and scrub and intersected by several rivers and streams. The northern part of Ghana features high plains. South-west and south-central Ghana is made up of a forested plateau region consisting of the Ashanti uplands and the Kwahu Plateau. The hilly Akwapim-Togo ranges are found along Ghana's eastern international border.

The Volta Basin takes up most of south-central Ghana and Ghana's highest point is Mount Afadja which is and is found in the Akwapim-Togo ranges. The climate is tropical and the eastern coastal belt is warm and comparatively dry, the south-west corner of Ghana is hot and humid, and the north of Ghana is warm and wet. Lake Volta, the world's largest artificial lake, extends through small portions of south-eastern Ghana and many tributary rivers such as the Oti and Afram rivers flow into it.

The northernmost part of Ghana is Pulmakom and the southernmost part of Ghana is Cape Three Points near Axim. Ghana lies between latitudes 4° and 12°N. South Ghana contains evergreen and semi-deciduous forests consisting of trees such as mahogany, odum, ebony and it also contains much of Ghana's oil palms and mangroves with shea tree and acacias found in the northern part of Ghana. Its southernmost coast at Cape Three Points is 4° 30' north of the equator. From here, the country extends inland for some to about 11° north. The distance across the widest part, between longitude 1° 12' east and longitude 3° 15' west, measures about .

The Greenwich Meridian, which passes through London, also traverses the eastern part of Ghana at Tema.

Area and boundaries

; Area:
:* Total: 238,537 km²
**''country rank in the world:'' 80th
:* Land: 227,533 km²
:* Water: 11,000 km²

; Area comparative
:* Australia comparative: slightly larger than Victoria
:* Canada comparative: slightly less than half the size of the Yukon
:* United Kingdom comparative: slightly smaller than the United Kingdom
:* United States comparative: approximately twice the size of Pennsylvania
:* EU comparative: approximately equal in size to Romania

;Land boundaries

:*total: 2,420 km
:*border countries: Burkina Faso (602 km) to the north, Ivory Coast (720 km) to the west, and Togo (1,098 km) to the east.

Terrain of Ghana

The terrain consists of desert mountains with the Kwahu Plateau in the south-central area. Half of Ghana lies less than above sea level, and the highest point is . The coastline is mostly a low, sandy shore backed by plains and scrub and intersected by several rivers and streams, most of which are navigable only by canoe.

A tropical rain forest belt, broken by heavily forested hills and many streams and rivers, extends northward from the shore, near the Ivory Coast frontier. This area, known as the "Ashanti," produces most of Ghana's cocoa, minerals, and timber. North of this belt, the elevation varies from above sea level and is covered by low bushes, park-like savanna, and grassy plains.

Irrigated land:

(2003)

Total renewable water resources:

(2011)

Geographical regions

Ghana is characterized in general by low physical relief. The Precambrian rock system that underlies most of the nation has been worn down by erosion almost to a plain. The highest elevation in Ghana, Mount Afadja in the Akwapim-Togo Ranges, rises above sea level.

There are four distinct geographical regions. Low plains stretch across the southern part of Ghana. To their north lie three regions—the Ashanti Uplands, the Akwapim-Togo Ranges, and the Volta Basin. The fourth region, the high plains, occupies the northern and northwestern sector of Ghana. Like most West African countries, Ghana has no natural harbours. Because strong surf pounds the shoreline, two artificial harbours were built at Takoradi and Tema (the latter completed in 1961) to accommodate Ghana's shipping needs.

Low plains

The low plains comprise the four subregions of the coastal savanna, the Volta Delta, the Accra Plains, and the Akan lowlands or peneplains. A narrow strip of grassy and scrubby coast runs from a point near Takoradi in the west to the Togo border in the east. This coastal savanna, only about in width at its western end, stretches eastward through the Accra Plains, where it widens to more than , and terminates at the southeastern corner of the country at the lower end of the Akwapim-Togo Ranges.

Almost flat and featureless, the Accra Plains descend gradually to the gulf from a height of about . The topography east of the city of Accra is marked by a succession of ridges and spoonshaped valleys. The hills and slopes in this area are the favoured lands for cultivation. Shifting cultivation is the usual agricultural practice because of the swampy nature of the very lowlying areas during the rainy seasons and the periodic blocking of the rivers at the coast by sandbars that form lagoons. A plan to irrigate the Accra Plains was announced in 1984. Should this plan come to reality, much of the area could be opened to large-scale cultivation.

To the west of Accra, the low plains contain wider valleys and rounded low hills, with occasional rocky headlands. In general, however, the land is flat and covered with grass and scrub. Dense groves of coconut palms front the coastline. Several commercial centres, including Winneba, Saltpond, and Cape Coast are located here. Winneba has a small livestock industry and palm tree cultivation is expanding in the area away from the coast, with the predominant occupation of the coastal inhabitants being fishing via dug-out canoe.

The Volta Delta, which forms a distinct subregion of the low plains, extends into the Gulf of Guinea in the extreme southeast. The delta's rock formation—consisting of thick layers of sandstone, some limestone, and silt deposits—is flat, featureless, and relatively young. As the delta grew outward over the centuries, sandbars developed across the mouths of the Volta and smaller rivers that empty into the gulf in the same area, forming numerous lagoons, some quite large, making road construction difficult.

To avoid the lowest-lying areas the road between Accra and Keta makes a detour inland just before reaching Ada, and approaches Keta from the east along the narrow spit on which the town stands. Road links with Keta continue to be a problem. By 1989 it was estimated that more than 3,000 houses in the town had been swallowed by flooding from the lagoon. About 1,500 other houses were destroyed by erosion caused by the powerful waves of the sea.

This flat, silt-composed delta region with its abundance of water supports shallot, corn, and cassava cultivation in the region. The sandy soil of the delta gave rise to the copra industry. Salt-making, from the plentiful supply in the dried beds of the lagoons, provides additional employment. The main occupation of the delta people is fishing, an industry that supplies dried and salted fish to other parts of the country.

The largest part of the low plains is the Akan Lowlands. Some experts prefer to classify this region as a subdivision of the Ashanti Uplands because of the many characteristics they share. Unlike the uplands, the height of the Akan Lowlands is generally between sea level and . Some ranges and hills rise to about , but few exceed . The lowlands that lie to the south of the Ashanti Uplands receive the many rivers that make their way to the sea.

The Akan Lowlands contain the basins of the Densu River, the Pra River, the Ankobra River, and the Tano River, all of which play important roles in the economy of Ghana. The Densu River Basin, location of the important urban centres of Koforidua and Nsawam

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