Islamic map of the world. The north is at the bottom, with the west to the right surrounded by unknown seas. The Indian Ocean, with the Red Sea, is on the left, with China, India and Iran in boxes to the right. The other sea shown is the Mediterranean next to which is a black square indicating Rome and a circle Constantinople. The Nile flows from the Mediterranean to the east and into the north then turn east and head towards a large circle indicating its source in Africa.

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Islamic map of the world. The north is at the bottom, with the west to the right surrounded by unknown seas. The Indian Ocean, with the Red Sea, is on the left, with China, India and Iran in boxes to the right. The other sea shown is the Mediterranean next to which is a black square indicating Rome and a circle Constantinople. The Nile flows from the Mediterranean to the east and into the north then turn east and head towards a large circle indicating its source in Africa. Wellcome Collection. Source: Wellcome Collection.