Algiers, officially Capital City of Algiers, is the capital city of Algeria, located on the Mediterranean Sea in the north-central portion of the country. In 2025, an estimated 4.325 million people resided within the urban area. Algiers is the largest city in Algeria, the third-largest city on the Mediterranean, the tenth-largest city in the Arab world, and the 19th-largest city in Africa by population. Algiers is the capital of the Algiers Province; it extends over many communes without having its own separate governing body. It extends along the Bay of Algiers surrounded by the Mitidja Plain and major mountain ranges. Its favorable location made it the center of Ottoman and French influences for the region, shaping it to be a diverse metropolis.