Mauritania is a country in Northwest Africa. It is the eleventh largest sovereign state in Africa and is bordered by the Atlantic Ocean to the west, Western Sahara to the north and northwest, Algeria to the northeast, Mali to the east and southeast, and Senegal to the southwest.
The country derives its name from the ancient Berber kingdom of Mauretania, which existed from the 3rd century BCE into the 7th century CE in the far north of modern-day Morocco and Algeria. Approximately 90% of Mauritania's land is within the Sahara; consequently, the population is concentrated in the south, where precipitation is slightly higher. The capital and largest city is Nouakchott, located on the Atlantic coast, which is home to around one-third of the country's million people. The government was overthrown on 6 August 2008, in a military coup d'état led by General Mohamed Ould Abdel Aziz. On 16 April 2009, Aziz resigned from the military to run for president in the 19 July elections, which he won.
Senegal ( undefined), officially the Republic of Senegal (undefined), is a country in West Africa. Senegal is bordered by Mauritania in the north, Mali to the east, Guinea to the southeast, and Guinea-Bissau to the southwest. Senegal also borders The Gambia, a country occupying a narrow sliver of land along the banks of the Gambia River, which separates Senegal's southern region of Casamance from the rest of the country. Senegal also shares a maritime border with Cape Verde. Senegal's economic and political capital is Dakar.
The unitary semi-presidential republic is the westernmost country in the mainland of the Old World, or Afro-Eurasia, and owes its name to the Senegal River, which borders it to the east and north. Senegal covers a land area of almost 197000 km2 and has an estimated population of about million. The climate is typically Sahelian, though there is a rainy season.
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 both sides of the lower reaches of the Gambia River, the nation's namesake, which flows through the centre of The Gambia and empties into the Atlantic Ocean. It has an area of 10689 km² 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.