In Assassin's Creed Origins, which historical region is the main setting of Bayek's story?

In Assassin's Creed Origins, the main setting of Bayek's story is Ptolemaic Egypt.

The game takes place in the first century BCE, during the reign of Cleopatra VII and the political struggle involving her brother Ptolemy XIII. Bayek of Siwa, a Medjay, travels through deserts, villages, tombs, and major cities while investigating the people responsible for a personal tragedy and discovering the origins of the Hidden Ones.

Ptolemaic Egypt was ruled by the Greek-speaking Ptolemaic dynasty after Alexander the Great's conquest and the division of his empire. Cleopatra was the dynasty's final active ruler. The game uses this historical background as the setting for a fictional origin story, blending real political figures with invented characters and secret organizations.

The phrase Ptolemaic Egypt distinguishes the setting from later Roman Egypt. Rome is already a major power in the plot, and Julius Caesar appears, but Egypt remains the primary region explored by Bayek. Origins also includes places such as Alexandria, Memphis, Cyrene, and the Sinai Peninsula, giving the setting geographical variety beyond the Nile Valley.