The World map of the Caliph Al-Ma'mun
Taken from : catalogue Library of Congress (map found on several websites)
As contained in the Kitab masalik al-absar by Ibn Fadlallah al-Umari (d. 1349 A.D.), MS 2797/1 Ahmet III Collection, Topkappi Sarayi Library, Istanbul. Includes ancillary reconstruction of the facsimile map by Dr. Aladdin Jokhosha. In this same work are also found the different sectional maps. Added is the map for East Africa.
The East African section of this map