Baghdad is the historical city explored by Basim in Assassin's Creed Mirage.
Mirage is set in ninth-century Baghdad during the Islamic Golden Age. Basim Ibn Ishaq begins as a street thief before joining the Hidden Ones and developing into an Assassin. The city is divided into districts with different landmarks, communities, and political pressures, allowing the game to focus closely on urban movement and stealth.
The story takes place decades before Assassin's Creed and presents the Hidden Ones as the direct predecessor of the later Assassin Brotherhood. Its setting includes the Round City of Baghdad, an important historical urban center associated with the Abbasid caliphate. The game also connects Basim to characters and ideas introduced in Assassin's Creed Valhalla.
Damascus and Jerusalem are major cities in the original Assassin's Creed, while Cairo is associated with parts of the broader series and other historical settings. Mirage's primary city is specifically Baghdad, not a generic Middle Eastern location.