Map of barid (postal) stations in the Yemen in ca. the ninth century AD, according to the historian Ibn Khurradadhbih, p. 153. Source:
Ibn Khurradadhbih, Abu al-Qasim 'Abd Allah. Kitab al-Masalik wa'l-Mamalik. Ed. M.J. de Goeje.  location = Leiden: E.J. Brill, 1889 (Arabic).
Own work
Ro4444