Algiers is the capital city of Algeria in North Africa. Algiers is located on a bay of the Mediterranean Sea and is an important port. Algiers was first settled over 1000 years ago and has now grown to a large city with a metropolitan population of over 3 million.While downtown Algiers looks modern, the capital is struggling to keep up with rapid growth and standards of living for most of its population is very poor.lgiers was first settled over 1000 years ago and has now grown to a large city with a metropolitan population of over 3 million. While downtown Algiers looks modern, the capital is struggling to keep up with rapid growth and standards of living for most of its population is very poor.