Senegambia
The Senegambia is, in the narrow sense, a historical name for a geographical region in West Africa, named after the Senegal River in the north and the Gambia River in the south. However, there are also text sources which state that Senegambia is understood in a broader sense and equated with the term the Western region. This refers to the coastal areas between Senegal and Sierra Leone, where the inland border in the east was not further defined. Geographically, the region lies within the tropical zone between the Sahel and the forests of Guinea, with Senegal and Gambian Rivers underpinning the region's geographical unity. The region encompasses the modern states of Senegal, The Gambia, and Guinea-Bissau, as well as portions of Mauritania, Mali, and Guinea. Wikipedia