To the small subset of people knowledgeable of Ancient Egypt and familiar with Assassin’s Creed: Origins, how historically accurate is the game, more specifically, its map?

There's a FAQ on the accuracy of Assassin's Creed: Origins (for some reason) that will probably help you. /u/cleopatra_philopater's answer to How accurate is the representation of Egypt in Assassin's Creed Origins? is especially wide-ranging.

You'd probably get a more specific answer if you narrowed your question down.