Algeria ( or ), officially the People's Democratic Republic of Algeria, is a former French colony and the largest country in Africa. It is part of the Maghreb region of Northwest Africa. Algiers is the capital. It is bordered by the Mediterranean Sea in the north, Tunisia in the northeast, Libya in the east, Niger in the southeast, Mauritania and Mali in the southwest, Western Sahara in the west and Morocco in the northwest. It is also the largest country in the Arab world.