The Sénégal River (French: Fleuve Sénégal) is a 1,790 km (1,110 mi) long river in West Africa that forms the border between Senegal and Mauritania.

The Sénégal's headwaters are the Semefé (Bakoye) and Bafing rivers which both originate in Guinea; they form a small part of the Guinean-Malian border before coming together at Bafoulabé in Mali. From there, the Senegal river flows west and then north through Talari Gorges near Galougo and over the Gouina Falls, then flows more gently past Kayes, where it receives the Kolimbiné. After flowing together with the Karakoro, it prolongs the former's course along the Mali-Mauritanian border for some tens of kilometers till Bakel where it flows together with the Falémé River, which also has its source in Guinea, subsequently runs along a small part of the Guinea-Mali frontier to then trace most of the Senegal-Mali border up to Bakel. The Senegal further flows through semi-arid land in the north of Senegal, forming the border with Mauritania and into the Atlantic. In Kaedi it accepts the Gorgol from Mauritania. Flowing through Bogué it reaches Richard Toll where it is joined by the Ferlo coming from inland Senegal's Lac de Guiers. It passes through Rosso and, approaching its mouth, around the Senegalese island on which the city of Saint-Louis is located, to then turn south. It is separated from the Atlantic Ocean by a thin strip of sand called the Langue de Barbarie before it pours into the ocean itself.

Senegal ⁱ/ˌsɛnɨˈɡɔːl/ (French: le Sénégal), officially the Republic of Senegal (République du Sénégal, IPA: [ʁepyblik dy seneɡal]), is a country in western Africa. It owes its name to the Sénégal River that borders it to the east and north. Senegal is externally bounded by the Atlantic Ocean to the west, Mauritania to the north, Mali to the east, and Guinea and Guinea-Bissau to the south; internally it almost completely surrounds The Gambia, namely on the north, east and south, exempting Gambia's short Atlantic Ocean coastline. Senegal covers a land area of almost 197,000 square kilometres (76,000 sq mi), and has an estimated population of about 13 million. The climate is tropical with two seasons: the dry season and the rainy season.

Dakar, the capital city of Senegal, is located at the westernmost tip of the country on the Cap-Vert peninsula. About 500 kilometres (300 mi) off the coast, in the Atlantic Ocean, lie the Cape Verde Islands. During the 17th and 18th centuries, numerous trading posts, belonging to various colonial empires, were established along the coast. The town of St. Louis became the capital of French West Africa (Afrique occidentale française, or AOF) before it was moved to Dakar in 1902. Dakar later became its capital in 1960 at the time of independence from France.