Baghdad is Basim's home and the primary setting of Assassin's Creed Mirage.
Mirage is set in ninth-century Baghdad during the Islamic Golden Age. Basim Ibn Ishaq begins as a street thief suffering from troubling visions before joining the Hidden Ones and training as an Assassin.
The game presents Baghdad as a dense urban environment divided into districts, including the Round City, Abbasiyah, Harbiyah, and Karkh. Historical figures and institutions are woven into the story, while the fictional plot follows Basim's progression through the Hidden Ones' order.
Damascus is important elsewhere in the franchise, especially in the first Assassin's Creed, but it is not Mirage's main city. Cairo is associated with Assassin's Creed Origins, and Samarra was a major Abbasid center but is not the game's primary setting.