In Assassin's Creed Origins, Bayek's home oasis is Siwa. Bayek is a Medjay from the Siwa Oasis in Egypt, and the game begins there before expanding across Ptolemaic Egypt.
Siwa is important to Bayek's identity and family life. The settlement includes the Temple of Amun, and the opening chapters establish Bayek's role as a local protector. From Siwa, his investigation develops into a wider struggle involving the Order of the Ancients.
Memphis and Alexandria are also major locations in Origins, which can make them easy to confuse with Bayek's home. Siwa is a real oasis in western Egypt, while the game uses historical places across the Nile Valley, the Delta, and the Mediterranean coast.