Mauritania , [a] officially the Islamic Republic of Mauritania , [b] is a country in Northwest Africa. It 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. By land area Mauritania is the 11th-largest country in Africa and the 28th-largest in the world; 90% of its territory is in the Sahara desert. Most of its population of some 4.3 million live in the temperate south ... Mauritania is a republic with two legislative houses; its head of state and government is the president, assisted by the prime minister. Inhabited in ancient times by Ṣanhājah Imazighen, in the 11th–12th century it was the centre of the Amazigh Almoravid dynasty, which imposed Islam on many of the neighbouring peoples. Mauritania facts: official web sites of Mauritania , links and information on Mauritania 's art, culture, geography, economy, history, travel and tourism, cities, the ... Inside Mauritania ’s mass deportation campaign targeting African migrants Mass crackdown on migrants follows deal signed with the EU to stem migration from source countries in Africa.