Guinea-Bissau is situated on the west coast of Africa and is bordered to the north by Senegal, the east and southeast by Guinea and west southwest by the Atlantic Ocean.
The country is swampy at the coast and low-lying inland, except in the northeast. There are no significant mountains. The most important rivers include the Cachew, Mansoa, Geba, Corubal, Rio Grande de Buba and Cacine. There are freshwater rivers inland, which are navigable for short distances.