The Gambia less than wide at its widest point, with a total area of . About (11.5%) of the Gambia's area are covered by water. It is the smallest country on the African mainland. In comparative terms, the Gambia has a total area slightly less than that of the island of Jamaica. Senegal surrounds the Gambia on three sides, with of coastline on the Atlantic Ocean marking its western extremity. The present boundaries were defined in 1889 after an agreement between the United Kingdom and France. During the negotiations between the French and the British in Paris, the French initially gave the
Wildlife of the Gambia soils of laterite formations. The local tree species include silk cotton "(Bombax costatum)", dry-zone mahogany "(Khaya Senagalensis)" in deeper soil areas and African rosewood "(Guibourtia coleosperma)". Short grasses and shrubs are seen thinly spread in the Sahelian habitats. The gallery forests (moisture forests), unlike the rainforest, thrive on groundwater and are integral to savannas. It is a rare habitat found only in Abuko Nature Reserve, Pirang Forest Park and in some stretches of the Gambia River with different set of species with some degree of overlap with rainforests. Urban habitat consists of numerous villages. The open areas in between have