Algiersis the capital and largest city of Algeria, located on the Mediterranean Sea and in the north central portion of Algeria. "Algiers the White" for the glistening white of its buildings as seen rising up from the sea, Algiers is situated on the west side of a bay of the Mediterranean Sea. The modern part of the city is built on the level ground by the seashore; the old part, the ancient city of the deys, climbs the steep hill behind the modern town and is crowned by the casbah or citadel, 400ft above the sea. The casbah and the two quays form a triangle.