Fra Mauro's depiction of the Lake Chad region correctly named some of the peoples and features of the area, like Bagirmi, Bulala (after they were the dominant power in Kanem), and the Mandara Mountains. He must've had 'native' informants from Kanem or Borno or access to decent Arabic sources by geographers.
But why continue to use the name "Organa" instead of Kanem? Fra Mauro knew of the Marghi, Mandara, Bagirmi, Bolala (Bulala in Kanem and Lake Fitri), and perhaps he thought Lake Chad was a giant marsh due to its seasonal fluctuations. But why continue to use the name Organa when his Arabic and/or Africans sources have specified Kanem and Borno as place names by the mid-15th century. Was it due to the fact that the Bulana rulers had already seized power in Kanem by this time? It could have been due to the already established pattern in medieval European Cartography to refer to Kanem as Organa, something which was already apparent in the 14th century map of Angelino Dulcert.
The Angelino Dulcert map also mentions the king of Organa fighting naked "blacks" by the sea, which I interpret to mean Lake Chad. There's a French translation and commentary of his map here that makes it even more likely to be Kanem.
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