Gambia River
Senegal is bounded by the Atlantic Ocean to the west, Mauritania to the north, Mali to the east, and Guinea and Guinea-Bissau to the south. It has a long internal border with The Gambia which lies on either side of the Gambia River but is otherwise surrounded by Senegal. The four major rivers, the Senegal River, the Saloum River, the Gambia River and the Casamance River, drain westwards into the Atlantic Ocean. The Lac de Guiers is a large freshwater lake in the north of the country while Lake Retba, near Dakar, is saline.