In Assassin’s Creed Origins, Siwa is the Egyptian oasis that serves as Bayek and Aya’s main home region.
Siwa is where Bayek works as a medjay and where the game’s opening events begin. The isolated oasis is important to Bayek’s identity, his relationship with Aya, and the personal revenge story that expands into the founding-era conflict between the Hidden Ones and the Order of the Ancients.
The real Siwa Oasis lies in Egypt’s Western Desert near the border with Libya. Its famous historical landmark is the Oracle Temple of Amun, which also appears in the game’s exploration and narrative. Origins later moves through a much larger recreation of Ptolemaic Egypt, including Alexandria, Memphis, and the Giza area.
Alexandria is a major city in the game, but it is not Bayek’s home. Siwa is the correct answer because it is the place most closely tied to his childhood, profession, and family.