region in W Africa, comprising the basins of the rivers Senegal & Gambia
See Senegambia in American Heritage Dictionary 4
A region of western Africa watered by the Senegal and Gambia rivers.
A confederation of Senegal and Gambia (1981-1989) intended to promote cooperation between the two countries in matters of foreign policy, security, and economic affairs. Senegal dissolved the confederation when Gambia refused to move closer toward union.