Algiers is the capital and largest city of Algeria. In 2011, the. An estimate puts the population of the larger metropolitan city to be around 5,000,000. Algiers is located on the Mediterranean Sea and in the north-central portion of Algeria or alternatively Alger la Blanche (“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.