Djamaa el Kebir, also known as the Great Mosque of Algiers, is a historic mosque in Algiers, Algeria. It is located within the Casbah, near the city's harbor. Dating to 1097, it is one of the few remaining examples of Almoravid architecture, although it has undergone other additions and reconstructions since its foundation. It is the oldest mosque in Algiers and is said to be one of the oldest mosques in Algeria after Sidi Okba Mosque and Sidi Ghanem Mosque.