Mount Athos, manuscript on vellum with many Greek islands 1420. Go to the database of the National Maritime museum (UK) to zoom in en read the text.
A 19th century version of this medieval manuscript was already on our long list.:
Buondelmonti, Cristoforo, Librum Insularum Archipelagi, 1824;
hv
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Athos – Agios Oros
Athos - Agios Oros 
It funny to see a minaret on the Holy Mountain!!?
It is not fysical reality what is depicted. Islam was growing, visible (in Greece) those centuries. The monasteries are not real, I think. The map just indicates: Mons Sanctus (Holy Mountain).
The minaret is strange , I agree, because the islam came in 1453. Is the image of a later date then 1420?
You can argue that the mapmaker had some knowledge of the location of the monasteries. My interpretation: in the middle Karyes, the small building. At the end the chapel on the summit although a mountain is not drawn, on the left Vatopedi, Iviron and lavra. On the right Chilandariou and Xenophontos.