The Gambia, officially the Republic of the Gambia, is a country in West Africa. Geographically, The Gambia is the smallest country in continental Africa; it is surrounded by Senegal, except for its western coast on the Atlantic Ocean. It is situated on both sides of the lower reaches of the Gambia River, which flows through the centre of the country and empties into the Atlantic Ocean. The national namesake river demarcates the elongated shape of the country, which has an area of 11,300 square kilometres (4,400 sq mi) and a population of 2,468,569 people in 2024. The capital city is Banjul, which has the most extensive metropolitan area in the country; the second- and third-largest cities are Serekunda and Brikama.

West Africa or Western Africa is the westernmost region of Africa. The United Nations defines Western Africa as the 16 countries of Benin, Burkina Faso, Cape Verde, The Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, and Togo, as well as Saint Helena, Ascension and Tristan da Cunha. The population of West Africa is estimated at 419 million people as of 2021, and at 381,981,000 as of 2017, of which 189,672,000 were female and 192,309,000 male. The region is demographically and economically one of the fastest growing on the African continent.