The Gambia The Gambia The Gambia (), officially the Republic of the Gambia, is a country in West Africa that is almost entirely surrounded by Senegal with the exception of its western coastline along the Atlantic Ocean. It is the smallest country within mainland Africa. The Gambia is situated on either side of the Gambia River, the nation's namesake, which flows through the centre of the Gambia and empties into the Atlantic Ocean. Its area is with a population of 1,857,181 as of the April 2013 census. Banjul is the Gambian capital and the largest cities are Serekunda and Brikama. The Gambia
Geology of Gambia Geology of Gambia The geology of Gambia is defined by thick and comparatively recent sequences of sediments and sedimentary rocks, deposited in the last 66 million years. The country is underlain almost entirely by geologically recent Cenozoic sedimentary rocks. Much deeper basement rocks are likely present, although they are not well understood. Most research has focused on oil and groundwater exploration. The oldest rock units recognized in the west of the country, along the Gambia River are sandstones and kaolinitic claystones from the Oligocene, Miocene or Pliocene. Ironstone, including iron oxides, gravel, clay and sand dating to the Pleistocene are