Click here.) Algeria (al Djazair) is a country in northern Africa, located by the Mediterranean Sea. Algeria's flag has two equal vertical bands of green and white (green is by the flagpole); in the center of the flag is a red crescent and a smaller, red, five-pointed star located within the crescent. The crescent and star, and the color green are traditional symbols of Islam (which is the official religion of Algeria). The color white symbolizes purity. The Algerian flag has a ratio of 2:3 (height to width). Algeria's flag was adopted on July 3, 1962, after Algeria became independent from France.