Senegal, republic in western Africa, bounded on the north by Mauritania, on the east by Mali, on the south by Guinea and Guinea-Bissau, and on the west by the Atlantic Ocean. The Gambia, a small, narrow country, forms an enclave in southern Senegal, extending inland along the Gambia River. The republic’s total area is 196,722 sq km (75,955 sq mi). Dakar is the capital and largest city.