It’s easy to take maps for granted, but they are an ongoing collaborative work. Maps give Us an idea of what is where, which is important if you are trying to get there, right? Or leave there.
Eratosthenes of Cyrene (see map) b. 276 BC, is famous as the Father of Geography, which is what that word at the top means. We can’t have History if We don’t have Geography, right? Right.
Eratosthenes was a Librarian at Alexandria, but it would not fit on this map, so you will have to consult another map to find it. Today there are lots of maps. Back then, not so much.