Lake Bosumtwi (Ghana) – Location, History, Facts

Lake Bosumtwi is a natural, bowl-shaped crater lake in Ghana's Ashanti Region that occupies an ancient impact structure.

Lake Bosumtwi, Ghana.

Country: Ghana
Coordinates: 6.5055° N, 1.4089° W

Lake Bosumtwi overview

Lake Bosumtwi is a natural, bowl-shaped crater lake in Ghana's Ashanti Region that occupies an ancient impact structure. It is the country’s best-known natural lake and fills a roughly 10.5-kilometre diameter crater with a surface area near 49 square kilometres. The lake reaches substantial depth in its central basin, and it holds significance for regional culture, freshwater ecology, and scientific studies of impact processes and paleoclimate records.

Lake Bosumtwi coordinates

Lake Bosumtwi is commonly mapped at approximately 6.5055° N, 1.4089° W, or 6.5055, -1.4089 in decimal degrees.

Degrees: 6.5055° N, 1.4089° W

Decimal: 6.5055, -1.4089

Where Lake Bosumtwi is located

Lake Bosumtwi lies in the central highlands of Ghana, within the administrative bounds of the Ashanti Region, southeast of the city of Kumasi. The lake sits in the Bosumtwe District and occupies a circular depression on the Ashanti upland plateau. Coordinates are approximately 6.5° north latitude and 1.5° west longitude, placing the lake inland from Ghana’s Gulf of Guinea. Surrounding topography includes a raised crater rim, forested slopes, and a catchment of small streams feeding into the closed basin.

Why Lake Bosumtwi is important

Lake Bosumtwi matters for multiple reasons: it is a culturally sacred site for Akan and Ashanti communities, a well-preserved meteorite impact lake, and a source of long sedimentary records used in climate research. The lake’s lacustrine sediments preserve continuous cores that scientists have used to reconstruct regional environmental change. Ecologically, the closed-basin system supports freshwater species and lake-dependent livelihoods. Geologically, the near-circular crater and intact rim distinguish Lake Bosumtwi from other African lakes that lack a clear impact origin.

History of Lake Bosumtwi

The lake basin formed when an extraterrestrial body struck the Ashanti uplands, producing a simple impact crater that later collected water and sediments. Over successive millennia the crater evolved into a stable freshwater lake as erosion and infill modified rim slopes and the basin accumulated organic and mineral deposits. Human interaction with the lake has a long history, with local Akan and Ashanti societies attaching spiritual meanings and ritual practices to specific shoreline sites. In modern times the basin attracted geological and paleoclimate researchers who targeted the lake for sediment coring and multidisciplinary study because of its well-preserved impact structure and continuous sedimentary sequence.

Natural features of Lake Bosumtwi

The defining physical feature is the circular crater shape, bounded by a distinct rim that rises above the lake basin and shows rocky exposures in places. The lake displays a deep central basin with layered lacustrine sediments composed of clays, silts, organic matter, and tephra or impact-derived material. Shorelines alternate between steep slopes and gentler benches where alluvial deposits accumulate. Small vegetated islets occur within the water body, and the catchment comprises mixed forest and agricultural mosaics on the crater flanks. Hydrologically the basin functions as a closed system without a natural surface outlet.

Environment, protection, and monitoring of Lake Bosumtwi

Lake Bosumtwi falls under Ghanaian jurisdiction and is subject to management by local traditional authorities alongside national institutions and academic partners. Environmental concerns include sedimentation, nutrient inputs from the catchment, and sustaining freshwater biodiversity, which guide monitoring programs by university researchers and governmental environmental agencies. Conservation and research collaborations emphasize long-term stewardship, scientific monitoring of water and sediment quality, and community-based resource management approaches rather than formalized international heritage listings.

Lake Bosumtwi facts

The crater that contains Lake Bosumtwi formed as the result of a meteorite impact, making the lake an extraterrestrial-impact feature. The lake is located near 6.5°N latitude and 1.5°W longitude in Ghana’s Ashanti uplands. Local Akan and Ashanti communities regard the lake as spiritually significant and associate several shoreline sites with traditional rites. Lake Bosumtwi is widely cited as Ghana’s principal natural inland lake of notable size and geological distinctiveness. The basin has been the focus of international scientific drilling and sediment-core studies to reconstruct regional paleoclimate records.

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