Added as illustration only, a page from a simplified version of Ibn al Shatir's work from 1465
Locality: Zaghawa (2) Longitude 56deg 30 min, latitude 11 deg 10 min South
(1) Qanbala: Qanbuluh: The island of Qanbalu from where the Zanj slaves were imported till the great Zanj revolt in Basra. (Zanzibar or Pemba).
(2) Zaghawa: also called Beri or Zakhawa, are a Sahelian Muslim ethnic group primarily residing in Fezzan North-eastern Chad, and western Sudan, including Darfur.