Physical Features & Drainage Systems of Ghana

Relief refers to the variation in height, slope, and shape of the physical land surface above sea level. • 1. The Akwapim-Togo Ranges: - Extends from near Accra northeastward across the Volta Region into the Republic of Togo. - Features rugged, folded quartzite hills and steep valleys. - Hosts Mount Afadjato (885 meters), the highest mountain peak in Ghana, located near Liati Wote in the Afadzato South District. - Features spectacular waterfalls including Tagbo Falls and Wli Falls (the tallest waterfall in West Africa). • 2. The Kwahu Plateau: - A prominent sandstone plateau rising over 600 meters, forming a steep scarp overlooking the Afram Plains. - Forms the major watershed dividing rivers flowing north into Lake Volta from rivers flowing south into the Atlantic. • 3. The Gambaga Escarpment: - A dramatic sandstone cliff located in the North East Region along the White Volta valley.

Areas of gentle, low-lying land below 150 meters above sea level: • 1. The Coastal Plains: - Extends along Ghana's 550 km coastline on the Gulf of Guinea. - Divided into: The Accra Plains (dry coastal savanna receiving minimal rainfall) and the Keta Plains (characterized by sandy sandspits and shallow lagoons like Keta Lagoon). • 2. The Volta River Basin Lowlands: - The largest lowland depression in central Ghana, occupying nearly 45% of the total land area. - Formed of flat, gently undulating shale formations surrounded by plateaus.

Drainage refers to the natural pattern formed by rivers, streams, and lakes that drain surface runoff into the ocean: • 1. The Volta River Drainage Basin (The Largest System): - Comprises the Black Volta (originating in Burkina Faso), White Volta, Red Volta, and Oti River. - Drains over 70% of Ghana's territory. • 2. Southern Coastal River Systems: - Independent rivers rising on the southern scarps of the Kwahu Plateau and Ashanti uplands, flowing directly south into the Atlantic: - River Pra (joined by Offin and Birim rivers), River Ankobra, River Tano, River Densu, and River Ayensu. • 3. Ghana's Prominent Lakes: - Lake Volta (Man-Made): Created in 1965 by damming the Volta River gorge at Akosombo. Largest artificial reservoir by surface area in the world (approx. 8,500 km²). - Lake Bosomtwe (Natural Lake): Ghana's sole natural lake, situated 30 km southeast of Kumasi. Formed inside an ancient meteorite impact crater, surrounded by forested hills.

Ghana's relief and rivers are indispensable economic engines: 1. Hydroelectric Power (HEP) Generation: - Akosombo Dam (1,020 MW), Kpong Dam, and Bui Dam (400 MW on Black Volta) supply bulk electricity powering homes, hospitals, mining companies, and VALCO. 2. Inland Water Transportation: - Lake Volta provides a cost-effective water transportation highway via the Volta Lake Transport Company, ferrying cargo and passengers between Akosombo port and Buipe in northern Ghana. 3. Irrigation and Agriculture: - Rivers provide water for irrigation projects (e.g. Kpong Irrigation Scheme) cultivating rice, vegetables, and sugar cane during dry seasons. 4. Fisheries and Livelihoods: - Lake Volta and coastal lagoons produce thousands of metric tons of freshwater tilapia, catfish, and mudfish annually. 5. Ecotourism Revenue: - Waterfalls (Wli, Boti, Kintampo), caves, Lake Bosomtwe, and Mount Afadjato generate significant tourism foreign exchange.