Analysis of information sources in references of the Wikipedia article "زنج" in Arabic language version.
ancient Arabic geography had quite a fixed pattern in listing the countries from the Red Sea to the Indian Ocean: These are al-Misr (Egypt) -- al-Muqurra (or other designations for Nubian kingdoms) -- al-Habasha (Abyssinia) -- Barbara (Berber, i.e. the Somali coast) -- Zanj (Azania, i.e. the country of the "blacks"). Correspondingly almost all these terms (or as I believe: all of them!) also appear in ancient and medieval Chinese geography.
ancient Arabic geography had quite a fixed pattern in listing the countries from the Red Sea to the Indian Ocean: These are al-Misr (Egypt) -- al-Muqurra (or other designations for Nubian kingdoms) -- al-Habasha (Abyssinia) -- Barbara (Berber, i.e. the Somali coast) -- Zanj (Azania, i.e. the country of the "blacks"). Correspondingly almost all these terms (or as I believe: all of them!) also appear in ancient and medieval Chinese geography.