- Banjul is the capital city of The Gambia, a small country in West Africa. It is located on the coast of the Atlantic Ocean and is the country's largest city. Banjul has a population of approximately 31,301 people (2013 census). The city is situated on an island at the mouth of the Gambia River and is connected to the mainland by a causeway. Banjul serves as the economic and administrative center of The Gambia, with many government offices located in the city. Tourism is also an important industry in Banjul, with visitors attracted to its colonial architecture, markets, and nearby beaches.