A tract of territory lying chiefly within the basins of the rivers Senegal and Gambia, West Africa, stretching from the Atlantic, between Cape Blanco and the mouth of the Gambia, inland to the Niger; embraces the French colony of Senegal, and various ill-defined native States under the suzerainty of France; the interior part is also called the French Soudan; the vast expanse of the contiguous Sahara in the N., and stretches of territory on the S., extending to the Gulf of Guinea, are also within the French sphere of influence, altogether forming an immense territory (1,000), of which St. Louis in Senegambia proper, is considered the capital; ground-nuts, gums, india-rubber, etc., are the chief exports.